You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Mary Mitchell. I would like to book a ticket to Atlanta, can you please help me out?

ASSISTANT: Sure, may I know your preferable dates to travel?

USER: I am travelling on these dates 03/25 and 03/27.

ASSISTANT: Can you please share your source and destination airport codes?

USER: I am flying from ORD to ATL. Make sure my connection limit is 0.

ASSISTANT: Yes, there is a flight available for your request from Delta airlines with a fare of 600. Shall I confirm your booking?

USER: I am preferring price with 200.

ASSISTANT: Sorry, no flight is available on your request.

USER: Ok no problem, thank you for your services.

ASSISTANT: You are welcome.