You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Stephanie Rodriguez.

ASSISTANT: Welcome to flight booking agency Stephanie.

USER: I am planning to change an existing reservation, due to some urgent work. Can you please change my reservation?

ASSISTANT: Sure, please wait a moment to check your previous reservation status.

USER: Sure.

ASSISTANT: We regret that, there is no reservation found with your name in our records.

USER: That's fine. Thank you for your help.

ASSISTANT: Thank you for using our services, have a great day.