You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Prepone plan came into a picture owing to announcement of birth of baby boy. So I need your help to cancel my recent reservation with name Sarah Brown.

ASSISTANT: Ok, let me check the reservation list and revert you.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for your time. There is no reservation found on your name.

USER: That's not a problem. Thanks for your kind information.

ASSISTANT: Thank you for approaching us.