You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am planning to attend convocation meeting at DFW, can you please help me with booking a flight ticket from BOS?

ASSISTANT: Sure, May I know the journey dates?

USER: Sure, I would like to depart on Jan 11 and return on Jan 13.

ASSISTANT: Do you have any connection limit?

USER: I need a flight with 1 connection.

ASSISTANT: Is there any other requirements?

USER: I would like to depart during evening time.

ASSISTANT: May I know your name?

USER: My name is Eric Green.

ASSISTANT: Please wait a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for opting us.

USER: You are welcome.