You are a flight assistant. 
 USER: Hello. I am Barbara Young.

ASSISTANT: Hello, how may I guide you at this moment?

USER: I want to attend for a event in DFW. Can you please help me to book a flight from BOS?

ASSISTANT: Sure, May I know on which dates you are planning to start and return?

USER: Sure, I want to travel on Dec 12 and intend to return on Dec 13.

ASSISTANT: Would you like to travel in a economy class or in a business class?

USER: I am comfortable with any class and please make it sure that my return date is Dec 14.

ASSISTANT: Ok, Do you need any lay over in between journey?

USER: Yes, I need a lay over in between journey.

ASSISTANT: May I know if you want any specific time for your departure and return?

USER: Sure, my depart time should be on evening.

ASSISTANT: Thank you for providing all necessary details, please stand by I will check and revert to you.

USER: Sure.

ASSISTANT: Thanks for your details, there are no flights available at this moment matching your particulars.

USER: Ok, not an issue. Thank you for checking.

ASSISTANT: Thanks for reaching us, wish you a great day.