You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am William Gonzalez. I want to cancel my reservation, due to heavy rainfall in Seattle. Can you help me in cancellation of ticket?

ASSISTANT: Sure. Sorry, there is no reservation found with the name that you have provided.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you and have a nice day.