You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I have an appointment with my family doctor in Dallas & Fort Worth. Can you book me a direct flight to reach there?

ASSISTANT: Sure, let me know your trip dates?

USER: I would start on Sept 21st and return on Sept 23rd.

ASSISTANT: May I know your takeoff airport code?

USER: I would start from BOS.

ASSISTANT: Is there any other restrictions?

USER: No.

ASSISTANT: Please share your name?

USER: I am Jessica Perez.

ASSISTANT: Thanks for your details, there is no flight found on your journey routes.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for availing us.