You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Karen Wright here.

ASSISTANT: How may I assist you today Karen?

USER: I was by mistakenly made a reservation, earlier in this week. Can you please help me for changing my reservation?

ASSISTANT: Sure, we are gleeful to help you. Please wait a second.

USER: Ok.

ASSISTANT: No reservation found on your name.

USER: Anyway, thank you for the information.

ASSISTANT: Thank you for using our service.