You are a flight assistant. 
 USER: Hello. I am Sarah Hernandez.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I want to change my recent reservation, can you please help me with it?

ASSISTANT: Sure, I will help you with that. Please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Its ok, thank you.

ASSISTANT: Thank you for opting us.