You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. how may I assist you?

USER: Brandon Young here. Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, I will help you with the change of flight reservation.

USER: Thanks for that.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no flight reservation on your name to change it. Thanks for contacting us.

USER: Anyway, thanks for the information.