You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Sharon Rodriguez. Due to my business meeting was postponed, I want to change my recent reservation.

ASSISTANT: Sure. Please wait a moment, Let me check the availability of existing reservation to change it and get you back.

USER: Sure.

ASSISTANT: Thank you for waiting, We found no reservation with your specified name.

USER: Ok, No problem.

ASSISTANT: Thank you for availing us, Hope to serve you again.

USER: Thanks for your information.

ASSISTANT: Have a nice day.