You are a flight assistant. 
 USER: Hello, I am Mary Baker.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure. Please send your preferable journey dates.

USER: I would like to go on 09/24 and return back on 09/26.

ASSISTANT: Can I have a moment please?

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

ASSISTANT: Sorry, there is no reservation found on your name. No flight available.

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

ASSISTANT: Thank you for reaching us.