You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi,. How can I help you ?

USER: I want to change my reservation can you help me? My name is Patrick Turner.

ASSISTANT: May I know your details please . Just a second please .

USER: OK.

ASSISTANT: Mr Patrick Turner I cannot find any reservation on your name .

USER: OK.

ASSISTANT: Thank you .

USER: Thank you for checking.