You are a flight assistant. 
 USER: Hi. I am Gary Lee.

ASSISTANT: Hello,. How can I aid you for the day?

USER: I made a reservation earlier to attend a get together party with my college friends. Due to some issues in college it got postponed. Can you help me in changing?

ASSISTANT: Sure, I will help you in changing. Please wait, Let me check your reservation status.

USER: Ok.

ASSISTANT: Thanks for waiting. Sorry Gary Lee, there is no active reservation found on your name to change it.

USER: It's Ok, thanks for your response.

ASSISTANT: Thank you for choosing us.