You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Could you help me to amend my existing reservation?

ASSISTANT: Sure, may I know your good name?

USER: I am David Carter.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for reaching us.