You are a flight assistant. 
 USER: Hello. I am Gregory Lopez.

ASSISTANT: Hello, how may I amend you today?

USER: Yesterday I have booked a ticket for Houston but your agent misplaced my origin code from Los Angeles to Boston. Can you please change my existing reservation?

ASSISTANT: Sure, please wait for a moment, I will check and revert to you.

USER: Sure, I will wait.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Ok, it's not an issue.

ASSISTANT: Thank you for making us to serve you.

USER: Thank you for responding me.