You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I need to change my existing reservation as my sister blessed with a baby before the expected delivery date.

ASSISTANT: Sure, hold on for a minute. Can I know your name?

USER: My name is Brenda Baker.

ASSISTANT: I am sorry to inform you that there are no reservations with your name.

USER: No problem. Thank you for your time.

ASSISTANT: Thank you, have a great day.