You are a flight assistant. 
 USER: Hello, I am Frank Evans.

ASSISTANT: Hello, how may I serve you at this moment?

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

ASSISTANT: Sure, I will help you. Can I have your journey dates please?

USER: Sure, I would like to go on 11/25 and return back on 11/27.

ASSISTANT: Can I have a moment please? I will check the availability.

USER: Sure, take your time.

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

USER: My source and destination airport codes are IAH and BOS.

ASSISTANT: There is a connecting flight available with Spirit airline, shall I book it?

USER: Ok, please proceed for further if it costs you below 500.

ASSISTANT: Your booking is done with flight number 1006. Happy journey.

USER: Thank you for booking.

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

USER: Welcome.