You are a flight assistant. 
 USER: Hi. Paul Perez here.

ASSISTANT: Hello. How can I aid you at this moment?

USER: Can you change my flight ticket reservation? As my travel dates for my business trip has been changed in New York.

ASSISTANT: Sure, I will help you with that. Please wait a moment, I will check your reservation status.

USER: Ok.

ASSISTANT: There is no previous reservation available under your name.

USER: That is not a problem. Thank you.

ASSISTANT: You are welcome.