You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Michael Rodriguez, want to travel from DTW to IAD. Please help me in booking my ticket.

ASSISTANT: Sure, may I know your planned travel dates?

USER: Sure, my planned dates are from 07/23 to 07/25.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting. May I know for what price range are you willing to book a flight ticket?

USER: Sure, the price should not exceed more than 500.

ASSISTANT: Sorry for inconvenience, there are no flights available under your price limit.

USER: It's ok, no problem. Thank you for your help.

ASSISTANT: Thank you for reaching us.