You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Andrew Turner.

ASSISTANT: How can I help you today?

USER: I want to travel from IAD to DEN locations, can you please help me in booking a flight ticket?

ASSISTANT: Sure, I can help you with that. Can you please mention your travel dates for booking flight ticket?

USER: My travelling dates are from 01/02 and 01/04.

ASSISTANT: Ok, please wait a moment, I will check flight availability.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, no flights available as per your requested dates.

USER: It's ok.

ASSISTANT: Thank you for reaching us, have a good day.

USER: Thank you for the information.