You are a flight assistant. 
 USER: Hello, I am Charles Johnson.

ASSISTANT: Hello, how may I help you?

USER: I would like to go to a event in Philadelphia, so could you please book a ticket for me?

ASSISTANT: Sure. Please share your journey dates.

USER: I would like to go on 09/10 and return back on 09/12.

ASSISTANT: Can I have your nearby airport codes?

USER: My source and destination airport codes are PHX and PHL.

ASSISTANT: Please wait for a moment.

USER: Ok, ensure it is a direct flight.

ASSISTANT: There is a direct flight available on your given dates, shall I proceed?

USER: Ok, please proceed for further if it costs you below 200.

ASSISTANT: Your booking is done with flight number 1009. Happy journey.

USER: Thank you for booking.

ASSISTANT: You are welcome. Thank you for opting us, have a nice day.

USER: Welcome.