You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I be of your assistance?

USER: I am Richard Rodriguez. I want to change my existing reservation due to postpone of my exams, so can you please help me in changing my reservation?

ASSISTANT: Sure, I will help you. Please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no active reservation on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.