You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Michelle Young. I want to change my existing reservation. Could you help me?

ASSISTANT:  Michelle Young, give me a moment, I will let you know the status of your reservation.

USER: Ok.

ASSISTANT: I regret to inform that there are no flight tickets reserved by the name Michelle Young.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us.