You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

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

ASSISTANT: OK. May I know your good name?

USER: I am Brenda Thomas.

ASSISTANT: There is no reservation found with your name.

USER: Ok.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your service.