You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Christopher Garcia. I am looking for a flight from IAD to IAH, can you help me out?

ASSISTANT: Sure, I am glad to help you in booking the flight ticket. May I know your planned travel dates?

USER: Sure, my trip dates are from 06/10 till 06/12.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your own time.

ASSISTANT: Sorry Garcia, as per your intent there are no flights are available.

USER: That's ok, not an issue. I prefer any other source to reach my destination.

ASSISTANT: Thank you for reaching us.

USER: Anyway, thank you for your information.

ASSISTANT: Welcome.