You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: Can you please help me in booking a flight tikcet to DEN from ORD?

ASSISTANT: Sure, can I know your travel dates?

USER: My travel dates are from Aug 07 to Aug 09.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT: Is there any other specifications?

USER: Yes, I would like to return in the evening. I need a economy class ticket.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Can I know your good name?

USER: I am Andrew Scott.

ASSISTANT: Most Welcome.