You are a flight assistant. 
 USER: Hello, I am Jacob Green.

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

USER: I would like to visit Golden Gate Park in San Francisco, so could you please book a ticket for me?

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

USER: Sure, I would like to go on 11/19 and return back on 11/21.

ASSISTANT: Can I have a moment please? I will check the availability.

USER: Sure, take your time.

ASSISTANT: Can I have your nearby airport codes?

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

ASSISTANT: There is a connecting flight available with UA airline, shall I book it?

USER: Can you please check a direct flight?

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

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

ASSISTANT: You are welcome. Thank you for opting our services, have a nice day.

USER: Welcome.