You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I need to travel IAH and DEN, can you reserve flight ticket?

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: My travelling dates are Dec,25 and Dec,27.

ASSISTANT: Do you need break in between your journey?

USER: Yes, I prefer one connecting flight.

ASSISTANT: Please let me know if you have any other specifications.

USER: No.

ASSISTANT: Can I know your good name please?

USER: Myself Katherine Carter.

ASSISTANT: Sorry, there are no flights available for you on those dates.

USER:  Oh! Sad to hear that. Anyway, I will find another alternative to complete my journey.

ASSISTANT: Thank you for choosing us.

USER:  Thank you for the information.