You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Cynthia Roberts. I need to change my reservation due to my planned event got postponed. So please help me with changing my reservation.

ASSISTANT: Sure, please hold on for a moment.

USER: Thank you. I will wait for your response.

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

USER: Oh! It may not be booked properly due to server issues. Anyway, thank you for your time.

ASSISTANT: Thank you.