You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER:  I am George Martin want to change my reservation  due to prepone of my meeting.

ASSISTANT: Sure, George Martin. Please give me a minute, I will check the reservation list.

USER: Ok.

ASSISTANT: Thanks for your patience, we did not find any reservation based on your name.

USER: Thank you for your help.

ASSISTANT: Thank you for contacting us.