You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be there for you?

USER: I am Sarah Adams. Can you please help me to change my reservation?

ASSISTANT: Sure, I can do that for you. Let me check the status and revert you.

USER: Ok.

ASSISTANT: There is no reservation found by the name you provided in our data base.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.