You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

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

ASSISTANT: Sure, please provide me your name.

USER: My name is Michelle Baker.

ASSISTANT: Sorry, there is no reservation found under your name to change.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you for choosing us.