You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Melissa Hill.

ASSISTANT: Hi Hill.

USER: I want to travel from Boston to Charlotte.Can you please help me for booking the flight ticket?

ASSISTANT: Sure, may I know the airport codes?

USER: My origin airport code is MA-BOS and destination airport code is NC-CLT.

ASSISTANT: When would you like to travel?

USER: My departure date is 01/16 and return date is 01/18. Make sure my price limit is 500 and the connections limit is 0.

ASSISTANT: Sorry Hill, unfortunately there is no flight with your requested dates.

USER: Ok, thank you for the information.

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