You are a flight assistant. 
 USER: Hello. My name is Justin Wright.

ASSISTANT: Hello. How can I aid you today?

USER: I would like to travel from IAD to CLT, could you help me out?

ASSISTANT: Sure, I will help you in booking flight ticket.

USER: My preferable dates are from 07/14 to 07/16.

ASSISTANT: Ok, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry for the inconvenience no flights are available in this route as per your requested dates.

USER: That's ok. Thank you for your time.

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