You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you please book a ticket from CLT to SFO?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: My travelling dates are Sept 17 and Sept 19.

ASSISTANT: Do you have any particular time for departing and returning?

USER: My return time is afternoon.

ASSISTANT: May I know your connection limit please?

USER: I am comfortable with any connection.

ASSISTANT: May I know your name please to proceed further?

USER: Sure, I am Matthew Green.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: Matthew Green, there are no flights available in your route.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.