You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: I am Cynthia Jones. My exams have suddenly rescheduled to next month, can you help me to change my existing reservation?

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: There is no reservation found on your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: You are welcome.