You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: As my exams were preponed, I need to change my existing reservation. Can you please help me in doing that?

ASSISTANT: Sure, we are here to help you. May I know your good name?

USER: I am Janet Martinez.

ASSISTANT: No reservation found on your name.

USER: Ok.

ASSISTANT: Thank you for reaching us, have a great day.

USER: Thank you for the response.