You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to do some changes in my existing reservation. Can you help me for that?

ASSISTANT: Sure, I will help you with your concern. May I know your name please?

USER: My name is Brandon Smith.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait for your response. That.

ASSISTANT: Brandon Smith, no reservation has been found on your name in our database.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for approaching us.