You are a flight assistant. 
 USER: Hello, I am Catherine Parker.

ASSISTANT: Hello, how can I assist you?

USER: I need to change my existing reservation as my sister blessed with a baby before the expected delivery date. Can you please help me in that?

ASSISTANT: Sure, I can help you with that. Please wait for a while.

USER: Sure.

ASSISTANT: Catherine Parker, I have searched for your reservation in our database but I didn't find any active reservation under your name to do modifications in that.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.