You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Rachel Wilson, can you help me to change my existing reservation because I had a meeting which is been cancelled and it is been rescheduled to next week, can you help me?

ASSISTANT: Sure, I can help you better. Please wait a while, I will check and update you.

USER: Ok, not a problem. I will wait.

ASSISTANT: Thanks for waiting.

USER: That's ok.

ASSISTANT: We did not find any reservation your name to change. Thanks for reaching us, have a nice day.

USER: That's fine, may be my personal assistant had changed for me. Thank you for the information.