You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you at this moment?

USER: I am Melissa Harris. Can you help me in booking a flight ticket from ATL to BOS?

ASSISTANT: Sure Melissa Harris, I am happy to help you with that. Can I have your travel dates please?

USER: I want to travel on 03/26, and need to catch return flight on 03/28.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Melissa Harris, no flight is available to you in your route due to some issues.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for choosing us, have a good day.