You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you from flight booking agency?

USER: I am so happy to change my existing reservation, as my exams have postponed suddenly. Can you please help me with this?

ASSISTANT: Sure, I am happy to help you with this. Please provide your name to check the reservation status in our database.

USER: I am James Young.

ASSISTANT: Wait a while please.

USER: Sure.

ASSISTANT: I have checked the database and couldn't find any reservation with the name James Young.

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

ASSISTANT: Thank you for utilising our services.