Clinohumite

A welcome to the shop from the characters,
A sort of "yeah i'll buy something" from the user as an option.
A "i didn't mean to come here/im not buying anything" option for the user too
A sorta "wait here, I'll grab a form for you to fill out in order to buy the thing"
A "why did you come here if you didn't want to buy anything/cool see you sometime)
and lastly a "Here's the form, please fill it out"

Tensho

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Entrance dialogue
"...Ah! Traveler, welcome. Please examine my menu carefully."
"Greetings. Welcome to my shop. Choose whatever you'd like."
"Hello there! Take your time, I sell all the finest drinks."

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Buying something
"I'll take... one of those. The [drink]."
"What's in that one? It sounds fancy."
"One [drink], please; and kinda quick if you can."

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Oops dialogue
"Hey hey hey, wait, I was just passing through."
"Actually, I'm not thirsty."
"What's even in a [drink]? I don't trust it."
"I changed my mind, no thanks."

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Bye then
"Oh... Well, then I suppose you'll be on your way."
"Ah. Are you certain? Goodbye."
"Then, please leave; I don't have all day."
"Do reconsider. I sell only the finest drinks."

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Order form (does that apply to this character?)
"One moment, let me find you a form..."
"Please be patient... Thank you."
"Where did I put that parchment.. Ah, here it is."
"Let me just..."

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Signing dialogue
"Please fill this out, thank you."
"Simply fill that in and put your signature there."
"Thank you very much, please do finish that quickly."