You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Michael Williams. I would like to change my reservation as I am leaving for business meet, can you please help me out?

ASSISTANT: Sure, I am here to help you with this. Please wait for a mean while.

USER: Sure.

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

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

ASSISTANT: You are welcome always.