You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER:  I am Sharon Martin. I want to change my reservation due to prepone of my cricket match. Can you please help me with it?

ASSISTANT: Sure, we are here to help you. Ok, please hold a moment.

USER: Ok.

ASSISTANT: Thanks for your valuable time, unfortunately no reservation found on your name.

USER: Thank you for your response.

ASSISTANT: Thank you for assistance.