You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: I am Patrick Parker. Can you change my existing reservation?

ASSISTANT: Sure, please wait for a minute.

USER: I reserved a ticket to other state with a small confusion in airport code. So, please check and tell me.

ASSISTANT: Ok. Sorry, there is no reservation found on your name.

USER: Ok. Thank you.

ASSISTANT: Thank you for availing us.