You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you now?

USER: I am Gregory Garcia, help me to book a flight from Washington to attend meeting at Chicago with cilent.

ASSISTANT: Sure, can I have your trip dates please?

USER: I will travel on 04/17 and return on 04/19.

ASSISTANT: Help me with the source and destination codes?

USER: My source point is DC-IAD and destination is IL-ORD.

ASSISTANT: Do you have any price limit?

USER: My budget is 200.

ASSISTANT: Thank you for the details, we found a flight in an airline AA of number 1008. Shall I proceed to book?

USER: Sure.

ASSISTANT: Your flight ticket has been booked.

USER: Thank you for service.

ASSISTANT: Thank you for reaching us.