You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am David Moore, I want to book a flight on 30/09 to attend a meeting with client. Can you help me to book a return flight on 10/02?

ASSISTANT: Sure, May I know your airport codes?

USER: My source point is IL-ORD and destination is CA-LAX. I need a flight on 09/30.

ASSISTANT: Do you have any price limit?

USER: Mu budget is 5000.

ASSISTANT: We found a AA airline with fare of 400 matches your schedule.

USER: Please proceed with booking.

ASSISTANT: Your ticket has been confirmed with flight number 1026.

USER: Thank you for the information.

ASSISTANT: Thank  you for reaching us.