You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Barbara Wilson from Minneapolis. I want to change my travel dates in my previous reservation, due to some problems I am unable to travel those dates so can you please help me with that?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Ok.

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

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

ASSISTANT: Thank you for reaching us.