You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Yesterday I have booked a ticket for Los Angeles but your agent misplaced my origin code from Detroit to Boston. So can you please help me to change an existing reservation?

ASSISTANT: Sure. Could you please help me with your name?

USER: My name is Christine Phillips.

ASSISTANT: Ok, please hold on.

USER: Sure.

ASSISTANT: Thanks for being waiting. Sorry, there is no reservation found on your given name.

USER: Ok, no problem. Thanks for your kind information.

ASSISTANT: Thank you for opting us.