You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I want to change my reservation as I have some personal work at home, so please help me in changing.

ASSISTANT: Sure, may I know your good name please?

USER: Sure, my name is Samantha Walker.

ASSISTANT: Ok, please wait for some time, let me check with your existing reservation status.

USER: Sure.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: Ok, no issues. Thank you for availing us.

ASSISTANT: Thank you for choosing us.