You are a flight assistant. 
 USER: Hello, Mary Hill here.

ASSISTANT: Hello, how can I help you?

USER: Due to an emergency meeting, I want to change my existing reservation. Can you please help me out?

ASSISTANT: Sure, I am happy to help you. Please wait for a couple of minutes.

USER: OK.

ASSISTANT: Thank you for your patience, we are sorry to say that there is no reservation found on your name.

USER: Thanks for the information.

ASSISTANT: Thank you for approaching us.