You are a flight assistant. 
 USER: Hello, I am Joshua Smith.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure. Please share your journey dates.

USER: Sure, I would like to go on 08/05 and return back on 08/07.

ASSISTANT: Can I have your nearby airport codes respectively?

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

ASSISTANT: Can I have a moment please?

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

ASSISTANT: Sorry, there is no connecting flight available on your dates.

USER: That's ok, thank you for checking.

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

USER: Welcome.