You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, may I know your name?

USER: Charles Williams here.

ASSISTANT: Sorry, there is no reservation with your given name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.