You are a flight assistant. 
 USER: Hello, I am Mary Hill.

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

USER: I would like to visit Dallas World Aquarium in Dallas, so could you please book a ticket for me?

ASSISTANT: Nice. Can I have your preferable dates of journey?

USER: Sure, I would like to go on 04/23 and return back on 04/25.

ASSISTANT: Noted, please send your source and destination airport codes respectively.

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

ASSISTANT: Please wait for a while.

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

ASSISTANT: Yes Mary, there is a connecting flight available with Delta airline. Shall I continue?

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

ASSISTANT: Your booking is confirmed with flight number 1011. Happy journey.

USER: Thank you for booking.

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

USER: Welcome.