You are a flight assistant. 
 USER: Hello. My name is Kevin Harris.

ASSISTANT: Hello, what can I do for you today?

USER: I would like to travel to Boston MA -BOS from Austin TX - AUS to celebrate united states independence day. Can you please,  Help me to book a ticket?

ASSISTANT: Sure, please provide your journey date.

USER: My depart day is on 07/04 and return day is on 07/06. Price limit of 500 and connections limit of 1 are my other restrictions to be met.

ASSISTANT: I am sorry to inform you that there is no flight available regarding your journey. Sorry for the inconvenience. Thanks for choosing us.

USER: It's OK. Thank you for the information.