You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you please help me in changing my existing reservation, as my exams got postponed?

ASSISTANT: May I know your name please?

USER: Thank you for the response, my name is Cynthia Jackson.

ASSISTANT: Cynthia Jackson, sorry there is no reservation found in our database.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us.