You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you today?

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

ASSISTANT: Ok. Please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, no reservation found with your name to change.

USER: That's ok, thank you for your help.

ASSISTANT: Thanks for availing us.