You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I assist you?

USER: My name is Lisa Gonzalez. I want to change an existing reservation.

ASSISTANT: Sure, please wait a minute. Let me check and get back to you.

USER: My new reservation departs from GA-ATL to CA-SFO. OK, you take your time.

ASSISTANT: Thanks for waiting. Unfortunately there is no reservation found with your name.

USER: OK, thank you for sharing information.

ASSISTANT: Thanks for choosing us and have a nice day.