You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I need you to make few changes in my recent flight booking.

ASSISTANT: Sure, may I know your name?

USER: My name is Margaret Walker.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry, I did not find any reservation by your name in our database.

USER: That's ok. Thank you.

ASSISTANT: Thanks for reaching us.