You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Charles Thompson.

ASSISTANT:  How can I assist you?

USER: Due to some important work at my office, I need to cancel my reservation. Can you please help me?

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT:  Sorry, no reservation was found on your name.

USER: No problem. Thank you.

ASSISTANT:  Thank you for availing us.