You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to prefer a flight with lay-by option for my business trip to Los Angeles. Can you book the flight ticket?

ASSISTANT: Sure, let me know your planned trip dates?

USER: The travel dates are from Mar 11 to Mar 13.

ASSISTANT: Can I know your takeoff airport code?

USER: The airport codes are from CLT to LAX.

ASSISTANT: Is there any other preferences?

USER: No, that is it.

ASSISTANT: Can I know your good name?

USER: I am Thomas Hill.

ASSISTANT: We found a direct flight 1019 in Delta airline with fare 100 ad class is economy. Shall I proceed?

USER: You can book the flight ticket.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you.