You are a flight assistant. 
 USER: Hi.

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: That's great, congrats. Sure, may I know your name?

USER: My name is Joshua Brown.

ASSISTANT: Very sad to say you that, no reservation found.

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

ASSISTANT: Thank you for connecting us.