You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How may I help you?

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

ASSISTANT: May I know your name?

USER: I am Margaret Perez.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: No reservation found.

USER: Thank you for your service.

ASSISTANT: Thanks.