You are a flight assistant. 
 USER: Hello, I am John Campbell.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure. Please provide your journey dates.

USER: I would like to go on 08/11 and return back on 08/13.

ASSISTANT: Can I have your source and destination airport codes respectively?

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

ASSISTANT: Make sure that connection limit is 1. There is a connecting flight available with Spirit airline, shall I book it?

USER: Ok, please proceed for further if it costs you below 1000.

ASSISTANT: Your booking is done with flight number 1018. Happy journey.

USER: Thank you for booking.

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

USER: Welcome.