You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Nancy Johnson here. Could you book my ticket in a business class?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My itinerary dates are Sept 17 and Sept 19.

ASSISTANT: Ok, may I know your location airport codes?

USER: I want to travel from CLT to DEN.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Ok, can you please tell us your departure and arrival time?

USER: I want to return in the morning.

ASSISTANT: Ok, please allow me a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight with your requests.

USER: No problem, thank you.

ASSISTANT: You are welcome, have a great day.