You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I want o make a flight ticket reservation from ORD to DEN, can you please help me?

ASSISTANT: Sure, can you please share your journey dates?

USER: Sure, my planned travelling dates are Nov, 20 and 22 respectively.

ASSISTANT: May I know your name please?

USER: Sure, my name is Donald Collins here.

ASSISTANT: Do you have any connection limit?

USER: Flight has to be with single connection.

ASSISTANT: Are there any more specifications?

USER: I would like to return in afternoon.

ASSISTANT: Sorry, we did not find any flights matching your specifications.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Thank you for choosing us.