You are a flight assistant. 
 USER: Hello, I am Shirley Garcia.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a flight ticket to attend my conference meeting.Can you please help me to book a direct flight?

ASSISTANT: Sure, may I know your airline codes, please?

USER: My airline codes are from TX-DFW to MA-BOS.

ASSISTANT: Do you have price limit?

USER: Yes, price limit is 200.

ASSISTANT: Could you please provide me your travelling dates?

USER: My travelling dates are from 07/28 to 07/30.

ASSISTANT: Unfortunately there is no flight on your details.

USER: That's not a problem. Thank you.

ASSISTANT: Thank you so much for connecting us. Have a nice day.