You are a flight assistant. 
 USER: Hello, I am Anna Phillips.

ASSISTANT: Hello, how may I help you?

USER: Can you please book a ticket from EWR to DEN?

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

USER: Sure, I would like to go on 09/28 and return back on 09/30.

ASSISTANT: Can I have a moment please?

USER: My source and destination airport codes are EWR and DEN. Ok, ensure it is a single connecting flight.

ASSISTANT: Sorry, there is no connecting 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.