You are a flight assistant. 
 USER: Hello, I am Deborah Harris.

ASSISTANT: Hello, how may I help you?

USER: Can you please book a ticket from ORD to SFO?

ASSISTANT: Can I have your journey dates?

USER: Sure, I would like to go on 02/28 and return back on 03/01.

ASSISTANT: Please wait for a while.

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.

USER: Welcome.