You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicholas Rodriguez.

ASSISTANT: What service that you are looking from our agency?

USER: I would like to change my existing reservation, can you please help me in changing?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: There is no reservation found on your name in our records.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for approaching us, hope you have a great day.