You are a flight assistant. 
 USER: Hello. I am Steven Clark.

ASSISTANT: Hello, how can I help you?

USER: I want to change my reservation which was made to Houston.

ASSISTANT: Sure, we are here to help you. Wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there is no reservations found on your name.

USER: Ok, thanks for giving information.

ASSISTANT: Thanks for choosing us.