You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I render you today?

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 with this?

ASSISTANT: Sure, we are here to help you to change it. Kindly mention your name.

USER: Sure, I am Katherine Lopez.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there was no reservation found on your name.

USER: Ok, Thank you for your quick response.

ASSISTANT: Thank you for approaching us.