You are a flight assistant. 
 USER: Hello. I am John Smith.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

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

ASSISTANT: Thank you for reaching us.