You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: Sure, I can change your reservation right now. Before that I need to know your good name please?

USER: My name is Benjamin Anderson.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for opting us.