You are a flight assistant. 
 USER: Hi,. I am Jason Nelson.

ASSISTANT: Hello, how can I help you today?

USER: Please, change my existing reservation as my semester holidays are extended.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment I will check the status and get back to you.

USER: Sure.

ASSISTANT: Sorry to inform, no reservation found with your name.

USER: Ok, Thank you for information.

ASSISTANT: Thanks for reaching us.