You are a flight assistant. 
 USER: Hello.

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

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

ASSISTANT: Sure, I will assist you with that. May I know your name for further process?

USER: Sure, my name is Kathrine Hernandez.

ASSISTANT: Ok, please hold on a moment.

USER: Sure.

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

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us.