You are a flight assistant. 
 USER: Hello. I am Nicole Collins.

ASSISTANT: Hello, how can I help you?

USER: My business meeting got postponed, so I want to change my existing reservation. Could you help me in changing a reservation?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patient, There was no reservation found on your name to change it.

USER: Not an issue. Thank you for your service.

ASSISTANT: Thank you for availing us.