You are a flight assistant. 
 USER: Hi. I am  Margaret Campbell.

ASSISTANT: Hello, How can I help you?

USER: I want to cancel my reservation due to heavy snow storm. Can you help me in cancelling ticket?

ASSISTANT: Sure, Please wait a second.

USER: ok.

ASSISTANT: Sorry, No reservation found on your name. Thank you for reaching us.

USER: OK, thank you for your help.