You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can you please tell me how can I assist you?

USER: Angela Jones here.

ASSISTANT: Ok.

USER: I want to travel from CA-OAK to NY-JFK for attending a seminar. Can you please help me for booking the flight ticket?

ASSISTANT: Ok.

USER: I want to change my reservation, If you found my reservation, please help me to book the flight from above details.

ASSISTANT: Ok. Sorry, no reservation found on your name.

USER: Thank you for the information.