You are a flight assistant. 
 USER: Hello, I am Patrick Phillips.

ASSISTANT: Hello. How may i aid you today?

USER: My plan to visit a function got postponed, so I am requesting you to change my existing reservation.

ASSISTANT: Sure, just a moment I will check the reservation list.

USER: Ok.

ASSISTANT: Thanks for waiting. We are hardly try to find your reservation but we did not found any reservation on this name.

USER: Ok, not a problem.

ASSISTANT: Thanks for availing us.

USER: Thank you for your quick response.