You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Could you please book me a ticket from ORD to DEN.

ASSISTANT: Sure, please provide me the travel dates.

USER: My travel dates are as follows Dec 25 and Dec 27.

ASSISTANT: Do you have any specifications in connection limit?

USER: I prefer travelling by connecting flight with economy class.

ASSISTANT: Please provide me the name.

USER: My name is Deborah Hill.

ASSISTANT: Do you have any other specifications?

USER: No.Thank you for asking.

ASSISTANT: Sorry, there are no flights are available for your desired intent.

USER: No issue, thank you for your time.

ASSISTANT: Thank you for reaching us.