You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello, how may I assist you?

USER: I am Raymond Jackson. I want to change my recent reservation as my joining date got postponed, can you please help me in changing the reservation?

ASSISTANT: Sure, please hold on.

USER: Ok.

ASSISTANT: No reservation found on your name.

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

ASSISTANT: Thank you for choosing us, have a nice day.