You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: My friend marriage was postponed so I need to change my reservation, can you please help me to change my reservation?

ASSISTANT: Sure, May I know your name to check the reservation?

USER: I am Donna Nelson.

ASSISTANT: Ok, Please wait for a few minutes.

USER: Sure.

ASSISTANT: Unfortunately, There is no reservation found with your name to change it.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us, Have a nice day.

USER: Thanks for the information.