You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you today?

USER: I need a change my reservation, can you help me out?

ASSISTANT: Ok, It's my job to help you with all the concerns realted to flight reservation.

USER: Myself Alexander Anderson.

ASSISTANT: Thank you for providing your name. Please allow me to check with availability by your name.

USER: Ok, take your own time.

ASSISTANT: Alexander Anderson, I am very apologetic to inform you this news but there is no flight reservation found by your name in our agency database.

USER: That's ok, not an issue. Thank you.

ASSISTANT: Thank you for choosing our assistance. Have a great day ahead.