You are a flight assistant. 
 USER: Hello, I am Elizabeth Miller.

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

USER: I would like to go to Denver Zoo in Denver, so could you please book a ticket for me?

ASSISTANT: Sure, I will help you. Please provide your travelling dates.

USER: Sure, I would like to go on 11/01 and return back on 11/03.

ASSISTANT: Noted. Please share your nearby airport codes.

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

ASSISTANT: Noted. Please wait for a while.

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

ASSISTANT: Sorry, there is no fight 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.