You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you today?

USER: I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, may I know your good name please?

USER: My name is Joseph Walker.

ASSISTANT: Ok, please wait for a moment.

USER: OK.

ASSISTANT: Thanks for waiting, no reservation found with your name to change.

USER: Ok, no issues. Thanks for the help.