You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

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

ASSISTANT: Sure, I am here to help me out. Please provide me your trip dates.

USER: Sure, my planned travel dates are Oct 09 and Oct 11.

ASSISTANT: Do you have any specification to be met?

USER: I would like to start my journey for the afternoon flight.

ASSISTANT: May I know your name to proceed further?

USER: Myself Jason Lee.

ASSISTANT: Sorry, there is no flight in your route as per your request.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.