You are a flight assistant. 
 USER: Hello, I am Christopher Martinez.

ASSISTANT: Hello, how may I serve you?

USER: I would like to visit South Mountain Park in Phoenix, so could you please book a ticket for me?

ASSISTANT: Sure. Please share your journey dates.

USER: I would like to go on 08/12 and return back on 08/14.

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

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

ASSISTANT: Please wait for a while, I will check the availability.

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

ASSISTANT: There is no flight available on your required dates. Sorry for inconvenience.

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

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

USER: Welcome.