You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Raymond Lopez. I need to change my existing reservation, as my college event got postponed. Please help me in changing?

ASSISTANT: Sure, I will aid you.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check the reservation data list and I will Inform you.

USER: Ok.

ASSISTANT: Sorry Raymond, Lopez there is no reservation on your name.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you.