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

ASSISTANT: Hello, how may I serve you?

USER: I would like to go to a beach in San Francisco, so could you please book a ticket for me?

ASSISTANT: Can I have your preferable dates of journey?

USER: Sure, I would like to go on 09/26 and return back on 09/28.

ASSISTANT: Sure. Can I have your nearby airport codes?

USER: My source and destination airport codes are DEN and SFO.

ASSISTANT: Can I have a moment please?

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

ASSISTANT: Sorry, there is no 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.