You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER: I want to change my existing reservation, as my schedule got changed regarding exams. Can you please help me with it?

ASSISTANT: Sure, I am glad to help you.

USER: Thanks a lot.

ASSISTANT: May I know your name please?

USER: My name is Joshua Nelson.

ASSISTANT: Thanks for your name, please wait.

USER: Ok, sure.

ASSISTANT: Thank you for waiting, no reservation was found on your name to change.

USER: Ok, it is not a problem. Thanks for the information.

ASSISTANT: Thank you for choosing us.