You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am John Mitchell, can you help me to book a flight to LAX on 12/25?

ASSISTANT: Sure, I am here to help you. Could you please provide your source code?

USER: My origin airport code is PHL.

ASSISTANT: Ok, please mention your return dates.

USER: I would like to return to PHL on 12/27.

ASSISTANT: Ok, please wait a moment I will check and get back to you.

USER: Sure, please search a flight with price limit of 200.

ASSISTANT: Thank you for waiting, I found a flight 1003 in Delta airline matching your details with price 100. Shall I proceed?

USER: Yes, proceed with booking.

ASSISTANT: Ok, your booking is done.

USER: Thank you.

ASSISTANT: You are welcome, have a nice journey.