You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to book a flight on 20th Dec to attend a meeting with client. Can you book a flight for me?

ASSISTANT: May I know your travelling dates?

USER: I will return on Dec 22.

ASSISTANT: Do you need any connecting flight for your journey?

USER: I want a connecting flight.

ASSISTANT: May I know your travelling airport codes?

USER: My source point is DEN and my destination is ATL.

ASSISTANT: May I know your name?

USER: My name is Nicole Nelson.

ASSISTANT: Sorry, no flights available on your route.

USER: Ok, thank you for the details.

ASSISTANT: Thank you for reaching us.