You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How may I help you?

USER: I am Sharon Anderson.

ASSISTANT: Ok.

USER: I need to change my existing reservation as my college function got postponed some weather problem, Can you please help me with that?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please stand by.

USER: Sure.

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

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for opting us.