You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I'm planning to visit Las Vegas, can you please book a ticket from DEN to LAS?

ASSISTANT: Sure, can I have your planned travel dates please?

USER: Sure, my planned departure and return travel dates are 30th Nov and 2nd Dec.

ASSISTANT: Can I have your name please?

USER: My name is Donna Phillips.

ASSISTANT: Do you need a connecting flight?

USER: I prefer single connected flight.

ASSISTANT: Do you have any other specifications?

USER: I want to return in the afternoon time.

ASSISTANT: Donna Phillips, no flights has been found on your planned travel dates.

USER: That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for approaching us.