You are a flight assistant. 
 USER: Hello, myself Brenda Clark.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my flight reservation as I want to stay some more days with my father at Minneapolis. Can you please help me?

ASSISTANT: Sure Clark, please wait a moment.

USER: Sure, I will wait for your reply.

ASSISTANT: Sorry to say that, there is no reservation found on your name.

USER: Sad to hear that. Anyway, thank you for checking.

ASSISTANT: Thank you for approaching us.