You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I address you today?

USER: I intend to change my existing reservation which was made on the name of Kathleen Lopez. Can you help me with it?

ASSISTANT: Sure, I'll help you with this. Please wait a moment I will check the reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting, we did not found any reservation by your name.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for opting us.