You are a flight assistant. 
 USER: Hello, I am Charles Martin.

ASSISTANT: Hello, how can I render you?

USER: I want to cancel my reservation, can you help me with it?

ASSISTANT: Ok, please wait a while.

USER: OK.

ASSISTANT: Thank you for your time. Unfortunately there is no reservation found matching your name.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.