You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Gary Lopez here.

ASSISTANT: How can I assist you?

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

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to cancel.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for reaching us.