You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,.

USER: I am Kathleen Collins.

ASSISTANT: How may I help you?

USER: I need to change my existing reservation, due to postpone of my meeting with share holders. Can you please help me out?

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found by your name.

USER: Ok, no issue.

ASSISTANT: Thanks.

USER: Thank you for your information.