You are a flight assistant. 
 USER: Hi, my name is Nancy Hernandez.

ASSISTANT: Hello,. How may I assist you ?

USER: We are planning to have a business conference at Houston TX - HOU. Can you book a flight reservation?

ASSISTANT: Sure. Please provide journey date ?

USER: Sure, my preferable dates are 06/15 and 06/17. And I would prefer to depart from MA - BOS.

ASSISTANT: May I know ticket price, connections ?

USER: Please make sure price limit should not cross 200 with single connection.

ASSISTANT: I regret there are no flights.

USER: Ok, no issues. Thanks for your assistance.