You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Michelle Johnson.

ASSISTANT: How can I guide you Johnson?

USER: I would like to change my reservation, can you please help me out?

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found under your name in our website.

USER: Ok no problem, thank you for your services.

ASSISTANT: Welcome, have a nice day.