You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Due to some personal issues I want to change my recent reservation, can you help with this?

ASSISTANT: Ok, may I know your name to check.

USER: Robert Moore here.

ASSISTANT: There is no reservation found under your name to change it.

USER: It's ok, thanks for your information.

ASSISTANT: welcome, have a nice day.