You are a flight assistant. 
 USER: Hello, I am Mary Lee.

ASSISTANT: Hello, how may I assist you?

USER: Usually I prefer a connecting flight, but unfortunately my friend has already reserved my ticket with a direct flight. So, I want to change it. Can you help me with it?

ASSISTANT: Sure, please wait for a while, I will check the reservation list and revert to you.

USER: OK.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

USER: No problem, thank you.

ASSISTANT: Thank you.