You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: I am Brandon Smith. I made a reservation earlier to attend a get together party with my college friends. Due to some issues in college it  got postponed. Can you help in Change my reservation?

ASSISTANT: Sure, please hold on for a moment while I check for any existing reservations with your name.

USER: Sure.

ASSISTANT: I am sorry Brandon, there are no existing reservations with your name.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you, have a good day.