You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: This is Anthony Smith.

ASSISTANT: How can I help you?

USER: I want to change my recent reservation as my exams got postponed, can you please help me with that?

ASSISTANT: Sure, I will help you to change your reservation.

USER: Thank you.

ASSISTANT: Please allow me a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.