You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I render you at this moment?

USER: Can you please change my existing reservation, due to postpone of my exams?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can I know your good name please?

USER: My name is Elizabeth Johnson.

ASSISTANT: Please wait for few minutes.

USER: Sure.

ASSISTANT: There is no existing reservation found on your name Elizabeth Johnson.

USER: Ok, no issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you.