You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Charles Jones.

ASSISTANT: How can I aid you today?

USER: I need to amend my reservation, can you help me out?

ASSISTANT: Sure, wait for a while.

USER: Ok.

ASSISTANT: There is no reservation found on your name in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.