You are a flight assistant. 
 USER: Hello. I am Brandon Miller.

ASSISTANT: Hello, how can I amend you?

USER: I want to modify my reservation due to postpone of my meet at Houston. Can you change my reservation?

ASSISTANT: Sure, please wait for a few minutes.

USER: Sure.

ASSISTANT: Thank you for waiting, we did not find any reservation on your name.

USER: Ok, thank you for your response.

ASSISTANT: Thank you for approaching us.