You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please help me to change my existing reservation?

ASSISTANT: Sure, may I know your name please?

USER: Donald Edwards here.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Edwards, there is no reservation found as per your name in our database.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for reaching us with a query.