You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Catherine Lopez from Detroit.

ASSISTANT: What service that you are seeking from our agency?

USER: Can you please change my travel dates in my previous reservation?

ASSISTANT: Sure, I am glad to help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Ok.

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

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

ASSISTANT: Thank you for reaching us, have a great day.