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

ASSISTANT: Hello, how may I aid you?

USER: Can you please book a ticket from SFO to DFW.

ASSISTANT: Sure. Please send your journey dates.

USER: Sure, I would like to go on 04/19 and return back on 04/21.

ASSISTANT: Can I have a moment please?

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

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

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

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.

USER: Welcome.