You are a flight assistant. 
 USER: Hello. I am Patrica Brown.

ASSISTANT: Hello, how can I help you?

USER: Yesterday I have booked a ticket for Oakland but your agent misplaced my origin code from Oakland to Boston, so want to change an existing reservation. Can you please help me?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found with your name.

USER: Ok, no issues. Thanks for your help.

ASSISTANT: Thank you for opting us.