You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Jack Baker.

ASSISTANT: How can I assist you?

USER: Can you book me a flight ticket routing from Philadelphia, PHL,  within fare 200?

ASSISTANT: Sure, on which dates you would like to depart and arrive?

USER: I would like to travel on 12/18 and 12/20.

ASSISTANT: May I know your landing airport code please?

USER: My airport codes are from PHL to LAX.

ASSISTANT: Please hold on, I will revert to you.

USER: Ok.

ASSISTANT: Thanks for being on hold, there is a connecting flight from an AA airline of fare 100 and flight number 1005. Shall I confirm your flight booking?

USER: Yes, please book this ticket.

ASSISTANT: Your flight ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thanks for your approach.