You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Angela wright here. My exams got postponed suddenly, so please change my reservation on other dates.

ASSISTANT: Sure. Please, wait a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, I am sorry to inform you that, I did not find any reservation on your name to change.

USER: That's ok. Thank you.

ASSISTANT: Thank you for availing us.