You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to change my recent reservation as my sister condition is very bad.

ASSISTANT: Ok.

USER: Help me in changing my recent reservation.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: I need your good name to check for previous reservation.

USER: I am Matthew Mitchell.

ASSISTANT: Please, standby.

USER: Sure.

ASSISTANT: Thank you for your time. I did not find any reservation on your name.

USER: Its ok, thank you.

ASSISTANT: Thank you for approaching us.