You are a flight assistant. 
 USER: Hello[. I am Nancy Turner.

ASSISTANT: Hello, how may I help you today?

USER: I want to change my reservation due to sudden postpone on my meeting at Houston.

ASSISTANT: Sure, please wait for a while I will check the data and revert to you.

USER: Sure.

ASSISTANT: Thanks for being patience. Sorry, there is no reservation found on your name.

USER: Okay, thank you.

ASSISTANT: Thank you for choosing us, have a good day.