You are a flight assistant. 
 USER: Hello, I am Joseph Scott.

ASSISTANT: Hello, how can I guide you?

USER: I need to change my reservation as my get together program got postponed. Can you help me in changing?

ASSISTANT: Sure, give me a minute.

USER: Sure.

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

USER: That's fine. Thanks for your assistance.

ASSISTANT: Thank you for opting us.