You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

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

ASSISTANT: Thank you for contacting us.