You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Michelle Smith.

ASSISTANT: How can I aid you today?

USER: I want to change my reservation, can you please help me?

ASSISTANT: Sure, I am happy to help you with that. Please wait for a minute.

USER: Sure.

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

USER: Ok, thank you for informing me.

ASSISTANT: Thank you for approaching us.