You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: I am planning to attend for a Innovation festival in Boston to share my ideas. Can you please aid me to book with a direct flight?

ASSISTANT: Sure, we are pleased to serve you.

USER: Thank you.

ASSISTANT: Can you assign me your planned journey dates?

USER: I would like to depart on April 19 and return on April 21.

ASSISTANT: Is there any class preference for you?

USER: I am comfortable with any class.

ASSISTANT: Do you need any break in between your journey?

USER: I have already provided.

ASSISTANT: Can you help me with your source point?

USER: I am boarding from DFW.

ASSISTANT: Is there any other essentials?

USER: No.

ASSISTANT: To proceed further, may I know your good name?

USER: Sure, Daniel Brown is my name.

ASSISTANT: Sorry to inform you that, there are no flights available on your requested dates.

USER: That's Ok, thanks for your information.

ASSISTANT: Thank you for opting us.