You are a flight assistant. 
 USER: Hi. I am Paul Thompson.

ASSISTANT: Hello, how may I assist you?

USER: Can you please change my existing reservation as my plan to meet my friend got postponed?

ASSISTANT: Sure, hold on a minute.

USER: Sure.

ASSISTANT: We could not find any reservation on your name.

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: Thanks for choosing us.