You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Brandon Roberts. Can you help me to change my reservation to next week?

ASSISTANT: Sure, I will help you. Please wait a while.

USER: Ok.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: No issues, thank you for your information.

ASSISTANT: Thank you for opting us, have a nice day.