You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I aid you?

USER: I am Nicholas Garcia. Can you please change my existing reservation, due to postpone of my exams?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there are no reservation found on your name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for approaching us.