You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how best I can help you today?

USER: I want to fly from DEN to HOU.Can you book a ticket from that route?

ASSISTANT: Sure, please share me your trip dates.

USER: My planned travel dates are 04/17 and 04/19.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I want a connecting flight with in the business class only.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: Sure, Deborah Walker here.

ASSISTANT:  Would you let us know if you have any other preferences?

USER: No more, thank you.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for availing us.