You are a flight assistant. 
 USER: Hello, I am Barbara Perez.

ASSISTANT: Hello, how may I help you?

USER: Can you please book a ticket from ORD to BOS?

ASSISTANT: Sure, please provide your travel dates too.

USER: Sure, I would like to go on 03/15 and return back on 03/17.

ASSISTANT: Sorry, there is no flight for you on with your preferences.

USER: That's ok, thank you for checking.

ASSISTANT: Thanks for choosing us.

USER: Welcome.