You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, May I know what kind of service you are looking for?

USER: Can you help me in booking my flight ticket from DEN to HOU?

ASSISTANT: Sure, we are glad to help you. May I know on what dates would you like to travel?

USER: I want to start on Jan 28th and my return date will be Jan 30th.

ASSISTANT: Do you want to fly out of business class or economy class flight?

USER: I prefer a economy class.

ASSISTANT: Do you prefer any lay by in between journey?

USER: I prefer a lay by flight.

ASSISTANT: Is there any another specifications on your trip, so that I can arrange like that only.

USER: No.

ASSISTANT: May I know your good name please?

USER: I am Linda Campbell.

ASSISTANT: Thank you for providing all necessary details, could you please wait for a while, I will check the availability and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, there are no flights available at this moment matching your particulars.

USER: Its ok, thank you.

ASSISTANT: Thanks for choosing us, wish you a great day.