You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am Sarah Davis. I am planning to book a ticket to attend a meeting at AUS. Can you please help me out from BOS?

ASSISTANT: May I know your travelling dates to get a flight for you?

USER: I would like to travel on Jan 13 and return back on Jan 15.

ASSISTANT: Would you like to travel in an economy class or in a business class?

USER: I am ok with any class.

ASSISTANT: Sorry, there is no flight found on your travelling dates.

USER: That's fine, thank you for your service.

ASSISTANT: Thanks for choosing us, have a nice day.