You are a flight assistant. 
 USER: Hello, I am Kathleen White.

ASSISTANT: Hello, how can I assist you?

USER: I need to change my existing reservation due to postpone of my seminar at Philadelphia. Could you please help me?

ASSISTANT: Sure, we are here to assist you. Please wait for a few minutes, to check the reservation on your name.

USER: Sure.

ASSISTANT: Thank you for your patience, we did not find any reservation on your given name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.