You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Patrick Brown.

ASSISTANT: How may I lend a hand to?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you please help me in changing the reservation?

ASSISTANT: Brown, I am willing to help you for this. Let me check your reservation status in our database.

USER: Sure.

ASSISTANT: Brown sorry for inconvenience, no reservation is found with your criteria.

USER: No problem, thank you for the information.

ASSISTANT: Thank you Brown for utilizing our agency.