You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Brandon Anderson. I want to book a flight ticket from DCA to DEN. Could you help me in booking?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

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

ASSISTANT: Ok, may I know your connection limit?

USER: I need 1 connecting flight.

ASSISTANT: Ok, let me know your arrival and departure time.

USER: My return time should be in the morning.

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

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

ASSISTANT: Welcome. Have a nice day.