You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Daniel King. My cousin marriage got postponed, I need to change my existing reservation. Can you help me for change reservation please?

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to change the reservation.

USER: Ok, no problem. Thanks for your good response.

ASSISTANT: Thank you for availing us, have a good day.