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

ASSISTANT: Hello, how may I address you?

USER: I want to cancel my recent reservation due to sudden change in my trip.

ASSISTANT: Sure.

USER: Can you help me?

ASSISTANT: We are here to help you. Please wait.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found on your name. Thank you for opting us.

USER: No issue. Thank you.