You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Could you please book a ticket with the name of Raymond Hill to DC-IAD?

ASSISTANT: Sure. Can I know your travelling dates?

USER: I am attending in a gala on 12/22 and return on 12/24.

ASSISTANT: Please provide origin point.

USER: I am fly out from TX-IAH.

ASSISTANT: Do you have any limitations?

USER: Yes, I need one connection in my journey.

ASSISTANT: Thanks for the information. We did not found any flights matching your criterion.

USER: Ok, no problem.

ASSISTANT: Thanks for contacting us.

USER: Thank you.