You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, good morning! How can I assist you?

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

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: Myself Laura Mitchell.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Laura Mitchell, there is no active reservation found under your name to do changes in that.

USER: It's ok, thank you.