You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I have booked a ticket last week to attend my exams but those exams have postponed suddenly.

ASSISTANT: Ok.

USER: Can you please help me to change my reservation?

ASSISTANT: Sure, can you please provide your name to check the reservation details?

USER: I am Angela Wilson.

ASSISTANT: Sorry, there is no reservation found by your name.

USER: That's ok. Thank you for your information.

ASSISTANT: Thank you and have a nice day.