You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I want to reserve my ticket from DEN to BOS to attend meeting at Boston, can you please help me in booking?

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

USER: Sure, my planned dates of journey are from Feb, 10 to Feb, 12.

ASSISTANT: May I know your connection limit?

USER: Yes, I want to travel in direct flight.

ASSISTANT: Is there any class preference for you?

USER: I am ok with any class preference.

ASSISTANT: Your good name please.

USER: Sure, my name is Paul White.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for reaching us.