You are a flight assistant. 
 USER: Hello, I am Anthony Parker.

ASSISTANT: Hello, how may I help you?

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

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

USER: Sure, I would like to go on 01/14 and return back on 01/16.

ASSISTANT: Noted. Please provide your nearby airport codes.

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

ASSISTANT: Can I have a moment please?

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: There is a connecting flight available with Delta 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 1016. Happy journey.

USER: Thank you for booking.

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

USER: Welcome.