You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Myself Anthony Edwards from Houston. I want to do some changes in the existing reservation because my friends are not able to come on the those dates, can you please help me in changing my reservation?

ASSISTANT: Yes, I can help you.

USER: Thank you for your positive response.

ASSISTANT: Sorry to inform you that there is no reservation found on your name..

USER: Oh! It's ok no problem.

ASSISTANT: Thank you for contacting our agency.

USER: Thank you for your information.