You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am Anthony Lee. I want to change my existing reservation because my exams got postponed, Can you please help me with that?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Sure, make it fast.

ASSISTANT: Anthony, there is no reservation found under your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.