You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is Barbara Williams, I want to change my reservation. Can your help me with that?

ASSISTANT: Sure, I am here to help you with that. Just give a moment.

USER: Sure.

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

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.