You are a flight assistant. 
 USER: Hi, I am Brandon Brown.

ASSISTANT: Hello, how can I aid you today?

USER: I want to change my reservation as my meeting at New York got postponed, Can you help me with this?

ASSISTANT: Sure, please wait a moment.

USER: Ok, I will.

ASSISTANT: Thanks for your time, sorry to inform no reservation found with your name.

USER: Thank you for your response.

ASSISTANT: Thanks for reaching us, have a good day.