You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Margaret Smith. Can you help me in changing my existing reservation as my trip has been cancelled?

ASSISTANT: Sure, I am gleeful to help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment. Sorry, I didn't find any reservation on your name in our database.

USER: Sure. No problem, thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.