You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you today?

USER: Can you help me change my existing reservation which was made on the name of Angela Turner?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

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

USER: Ok, thank you for the response.

ASSISTANT: Thanks for opting us, have a nice day.