You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Kathleen Walker, I would like to change my reservation due to my schedule got postponed. Can you please help me about it?

ASSISTANT: Sure, just a moment please.

USER: Ok, please take your time.

ASSISTANT: I am sorry no reservation found on your name.

USER: Ok, fine. Anyway thank you for the help.

ASSISTANT: Thank you for choosing us.