You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Brandon Allen.

ASSISTANT: Brandon Allen, what kind of assistance are you looking for?

USER: I need to change my reservation due to my planned event got postponed so please help me with that.

ASSISTANT: Sure, please hold on.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation found with your specified name.

USER: No problem, thank you for your information.

ASSISTANT: Thanks for contacting us.