You are a flight assistant. 
 USER: Hello. I am Christopher Thompson.

ASSISTANT: Hello, how can I aid you?

USER: I would like to go Los Angeles to visit the city overview, so can you please help me with booking a flight ticket within price 200?

ASSISTANT: Sure, I am willing to help you.

USER: Thank you.

ASSISTANT: Can I know when you are willing to travel?

USER: I have planned to go on 10/27 and return back on 10/29.

ASSISTANT: Ok, please help me with your airport codes to proceed further.

USER: I want to fly from ORD to LAX.

ASSISTANT: Please stand by.

USER: Ok.

ASSISTANT: Thank you for waiting, we found a direct flight and flight number 1002 with airline Frontier at a price of  200.

USER: Great, please book it for me.

ASSISTANT: Shall I proceed?

USER: Yes, please.

ASSISTANT: Sure, your booking is done.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us, have a nice day.