You are a flight assistant. 
 USER: Hello. I am Dennis Campbell.

ASSISTANT: Hello, how can I serve you today?

USER: Due to my health issue, I need to cancel my reservation, help me with it.

ASSISTANT: Ok, give me a minute.

USER: Sure.

ASSISTANT: There is no reservation found on your name.

USER: Thank you for your assistance.

ASSISTANT: Thank you for opting us.