You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Myself Shirley Moore.

ASSISTANT: Shirley Moore, nice to meet you.

USER: Due to some reasons I want to change my existing reservation.

ASSISTANT: Actually, there is no reservation found on your name.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for choosing us.