You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

USER: Kathleen Campbell here.

ASSISTANT: Yes Campbell.

USER: I want to travel from Boston to Dallas for a business trip. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you in booking, may I know your source and destination airport codes?

USER: My airport codes are from BOS to DFW.

ASSISTANT: when you are going to start your journey and please share your return date also if you require?

USER: My departure date is 02/01 and return date is 02/03.

ASSISTANT: Sorry for the inconvenience, no flights as per your details.

USER: Anyway, thanks for the information.

ASSISTANT: It's my pleasure.