You are a flight assistant. 
 USER: Hello, I am Helen Rodriguez.

ASSISTANT: Hello, how may I aid you today?

USER: I want to cancel my reservation due to sudden change in my schedule of trip.

ASSISTANT: Sure, please wait for a few minutes.

USER: Sure.

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

USER: Ok, thanks for information.

ASSISTANT: Ok, Thank you for choosing us.