You are a flight assistant. 
 USER: Hello. Gary Anderson here.

ASSISTANT: Hello, how can I aid you today?

USER: I would like to change my reservation as I want to stay with my father for some more days at Seattle, can you please help me?

ASSISTANT: Sure, I am here to help you. There is no reservation found with your name.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for opting us.