You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Myself Brenda Gonzalez from Austin. I want to change my travel dates in my previous reservation. Can you please help me with that?

ASSISTANT: Sure, please wait for for a moment.

USER: Ok, thank you for your positive response.

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

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: You are welcome.