You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, may I know how best I can help you today?

USER: Could you please change my existing reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can I have your name please?

USER: My name is Dorothy Rodriguez.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thank you for waiting, we did not find any reservation on your name in our database.

USER: Ok, Not an issue. Thank you.

ASSISTANT: Thank you for selecting us.