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

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Thank you. I have planned my travel dates are Feb 18 and Feb 20.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I am looking for single connecting flight.

ASSISTANT: Do you have any particular time for departing and returning?

USER: Yes, I would like to return in afternoon  time.

ASSISTANT: Sorry, there is no flight available in this route.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for approaching us.

USER: Most welcome.