You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: Would it be possible to change my reservation to new travel dates?

ASSISTANT: Ok, I am here to help you with that. May I know your name?

USER: Sure, I am Brenda Adams.

ASSISTANT: Please wait for a minute.

USER: Sure.

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

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for approaching us.