You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today from my end?

USER: Can you help me to book flight ticket from ATL to DEN?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: My trip dates are Sept 20 and Sept 22.

ASSISTANT: May I know your name?

USER: Gary White here.

ASSISTANT: Is there any requirement?

USER: I need a connecting flight which depart and return in the evening.

ASSISTANT: Sorry Gary White, there is no flight in your route as per your requirement.

USER: Ok, not a problem. Thank you for the information.

ASSISTANT: Ok, thank you for reaching us.