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

ASSISTANT: Hello, how may I serve you?

USER: Can you help me in changing my reservation, as my exam is postponed?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name to make changes further.

USER: That's ok, thank you.

ASSISTANT: Thank you for your approach.