You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: Aid me in booking a flight ticket with the name of Robert Lee from Washington, IAD.

ASSISTANT: Sure, may I know your origin airport code?

USER: Destination is at PHL.

ASSISTANT: May I know your travelling dates?

USER: 10/11 - 10/13 are the journey dates.

ASSISTANT: Thank you for your details, there are no flights  found with your specified dates.

USER: Not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for aiding me.

ASSISTANT: May I know your good name. Ok, thank you.

USER: Ok. Thank you.