You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Samuel Brown. I want to book a flight ticket from CLT to DCA. Could you help me in booking?

ASSISTANT: Sure, please provide your trip dates.

USER: My travelling dates are from Feb 09-11.

ASSISTANT: Do you have any specifications?

USER: I need a halt.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.