You are a flight assistant. 
 USER:  Hi, Margaret Nelson here.

ASSISTANT: Hello, how can I support you?

USER: I want to reach Denver, to visit Spacious Modern Studio Downtown on 03/05. Can you help me with booking flight ticket, within fare 500?

ASSISTANT: Sure, we are euphoric to help you.

USER: Thank you.

ASSISTANT: May I know your return date?

USER:  I will catch return flight on 03/07.

ASSISTANT: Ok, Kindly mention your destination airport code.

USER: CO - DEN, is my destination airport code.

ASSISTANT: Ok, please let me know your source point.

USER: My source point is Atlanta, GA - ATL.

ASSISTANT: Ok, please wait for a few minutes.

USER:  Sure, I will wait.

ASSISTANT: Thank you for being patient, There were no flights found with your given details.

USER: That's ok, I will choose another alternative to reach Denver. Thanks for your kind information.

ASSISTANT: Thank you for opting us.