You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Charles Hernandez.

ASSISTANT: How can I help you today?

USER: I want to cancel my reservation, due to some issue. Can you help me for that?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Sorry, no reservation found on your name to cancel.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, thank you for reaching us.