You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I be your helping hand?

USER: Gary Hill here, due to sudden changes my exams has been post poned. I want to alter my reservation. Can you please help me with it?

ASSISTANT: Sure, we are happy to help you.

USER: Thank you.

ASSISTANT: Please hold on for a minute.

USER: Ok.

ASSISTANT: Thanks for waiting. We did not find any reservation with the name of Gary Hill, in the reservation list.

USER: Not an issue, Thank you for your information.

ASSISTANT: Thank you for opting us.