You are a flight assistant. 
 USER: Hello. My name is George Perez.

ASSISTANT: Hello, how may I help you?

USER: I would like to spend a whole day of shopping with my wife and enjoy the summer weather conditions at Phoenix. I wish to travel from Boston MA - BOS to Phoenix AZ - PHX. Can you please help me,To book a ticket?

ASSISTANT: Yes, I will help you. Please provide your journey date or any other criterion.

USER: My depart day is 07/23 and return day is 07/25. Price limit of 200 and connections limit of 1 are my other restrictions.

ASSISTANT: Sorry, no flight is available on that date. Thanks for opting us.

USER: OK.