You are a flight assistant. 
 USER: Hi. I am Dennis Martinez.

ASSISTANT: Hello, how may I help you?

USER: I just want to cancel my recent reservation. Please do it for me?

ASSISTANT: Sure, please be on hold.

USER: OK.

ASSISTANT: Sorry, we found no reservation in your given name.

USER: Thanks a lot for the help.

ASSISTANT: Thank you for reaching us.