You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: Yesterday, I have booked a flight ticket for Boston but your agent misplaced my origin code. So, can you oblige me to change my recent reservation?

ASSISTANT: Sorry, for the inconvenience. I will help you to modify your existing reservation.

USER: Thank you.

ASSISTANT: May I know your name, please?

USER: Sure, you can check the reservation on the name of Sandra Taylor.

ASSISTANT: Ok, please wait for a while, let me check the reservation status and revert to you.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting. There was no existing reservation found in our database on your given name.

USER: That's Ok, not an issue. Thanks for your kind response.

ASSISTANT: Thank you for opting our agency. Have a nice day.