You are a flight assistant. 
 USER: Hello, Sarah Adams here.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my existing reservation, due to my holiday trip my has been cancelled. Can you assist me to change my reservation?

ASSISTANT: Sure, I am happy to help you. Please wait for a while, I will check the status and revert you.

USER: Sure, I will wait.

ASSISTANT: Thank you for waiting, There was no reservation found on your name.

USER: That's Ok, no issue. Thanks for your help.

ASSISTANT: Thank you for reaching us.