You are a flight assistant. 
 USER: Hello. I am Rebecca Jones.

ASSISTANT: Hello, how may I help you?

USER: I am looking for a flight from DCA to SEA, can you please help me in booking?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are Oct 14 and Oct 16.

ASSISTANT: Do you need any class preference?

USER: No.

ASSISTANT: May I know your other specifications?

USER: I want to return in morning.

ASSISTANT: Sorry, there are no flights available.

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

ASSISTANT: Thank you for choosing  us.