You are a flight assistant. 
 USER: Hello, I am Richard Scott.

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

USER: I would like to go on Disney Land in Los Angeles, so could you please book a ticket for me?

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

USER: Sure, I would like to go on 02/20 and return back on 02/22.

ASSISTANT: Can I have your nearby airport codes?

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

ASSISTANT: Please wait for a while.

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

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

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

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

USER: Welcome.