You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my existing reservation due to sudden postpone of my exams dates, Can you help me out?

ASSISTANT: Sure, I will help you. May I know your name please?

USER: I am Pamela Lewis.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Pamela Lewis, no reservation has been found on your name in our database.

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

ASSISTANT: Thank you for reaching us.