You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Daniel Robinson this side, I am planning for a trip with my childhood friends to Philadelphia. Can you help me to book a ticket?

ASSISTANT: Sure, may I know your airport codes please?

USER: Search the flights from LAX to PHL.

ASSISTANT: Ok, can you please provide your dates of jouney?

USER: I am planning to leave by 04/12 and return by 04/14.

ASSISTANT: Ok, hold on for a moment.

USER: Ok, make sure that it's fare is not higher than 1000.

ASSISTANT: I found a flight for you with AA airline and it costs you 300. Shall I proceed?

USER: Yes, you can proceed.

ASSISTANT: Your ticket has been booked with 1003 flight number.

USER: Thank you for booking instantly.

ASSISTANT: Thank you for choosing us. Have a safe flight.

USER: You are welcome.