You are a flight assistant. 
 USER: Hello, I am Brandon Martin.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I would like to fly with the direct flight from Atlanta to attend a client meeting in San Francisco, can you help me to book a economy class ticket?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: I would like to start from Atlanta, GA-ATL to reach San Francisco, CA-SFO.

ASSISTANT: Ok, when would you like me to book a flight ticket?

USER: I need to depart on 11/28 and my return date will be on 11/30.

ASSISTANT: Ok, How much you can afford for a flight ticket?

USER: I can pay up to 500 for the flight ticket.

ASSISTANT: Ok, please wait for some time.

USER: Sure.

ASSISTANT: We found a Jet Blue airline with fare of 100 matches your travelling schedule. Shall I proceed with booking?

USER: If it is a direct flight, please proceed with the booking.

ASSISTANT: Sorry,  we could not find a direct flight at this moment.

USER: No issues, I'll choose any alternate way to reach my destination. Thank you for your information.

ASSISTANT: Thank you for reaching us.