You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation due to some issues, can you please help me with that?

ASSISTANT: Sure, can I know your name?

USER: Sure, I am Donna Anderson.

ASSISTANT: We found reservation on your name, please provide your journey points?

USER: Sure, I want to fly from MSP to ATL.

ASSISTANT: May I know your journey dates?

USER: My journey dates are Aug 27 and Aug 29.

ASSISTANT: Any other requirements to be met?

USER: I need a flight with single connection.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us.