You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Matthew Collins. I want to cancel my recent reservation due to sudden change in my trip. Can you help me?

ASSISTANT: Sure, please give me a minute.

USER: Ok.

ASSISTANT: Sorry Collins, there is no reservation available on your name.

USER: That's fine, Thank you.

ASSISTANT: You are welcome.