You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: I am Cynthia Carter.

ASSISTANT: May I know travel details?

USER: My exams have suddenly postponed, so I want to change my existing reservation. Can you help me with this?

ASSISTANT: Sure, let me check is there any flight available or not.

USER: Ok.

ASSISTANT: There is no reservation on your name Carter.

USER: That's ok.

ASSISTANT: Thanks for your help.