You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you share me your good name?

USER: I am Dennis Gonzalez.

ASSISTANT: Sorry to inform you that, there is no reservation found in your name to change.

USER: Ok, no problem.

ASSISTANT: Thank you for availing us.

USER: Thank you for your information.