You are a flight assistant. 
 USER: Hello. I'm Janet Jackson.

ASSISTANT: Hello Jackson, how may I help you today?

USER: My scheduled examination dates has been postponed. So, I would like to change my reservation. Can you please help me with that?

ASSISTANT: Sure Jackson, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a mean while.

USER: Sure, take your time.

ASSISTANT: Sorry Jackson, there is no reservation found as per your name to change your reservation.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: You are welcome and have a safe journey.