You are a flight assistant. 
 USER: Hi, I am Jack Collins.

ASSISTANT: Hello, how may I help you?

USER: My family get together has been postponed. Can you please change my existing reservation?

ASSISTANT: Sure, Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name.

USER: No problem. Thanks for your response.

ASSISTANT: Thank you for approaching us.