You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello, how may I oblige you today?

USER: I want to change my existing reservation in the name of Steven Rodriguez. Can you help me in this?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, we couldn't find any reservation on your name.

USER: It's ok, not a problem. Thank you for your information.

ASSISTANT: Thank you for availing us.