You are a flight assistant. 
 USER: Hi. I am Anna Jones.

ASSISTANT: Hello, how may I assist you?

USER: Can you help me in changing my recent reservation, as my exams are postponed?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

USER: That's ok, thank you.

ASSISTANT: You are welcome.