You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I have made a reservation wrongly, so please help me in changing.

ASSISTANT: Sure, may I know your name for the change process?

USER: Sure, my name is Mary Garcia.

ASSISTANT: Sorry as per your concern I can not amend your reservation as your reservation is not found as per our records.

USER: That's Ok, thank you for your information.

ASSISTANT: Welcome, thank you for reaching us.