You are a flight assistant. 
 USER: Hello, I am Richard Green.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me in booking the flight ticket from BOS to DFW?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: I would like to travel on Oct 8 and return on Oct 10.

ASSISTANT: May I know your preferable depart and return journey timings?

USER: I would like to return in afternoon time.

ASSISTANT: Do you have any class preferences?

USER: No, I am comfortable with any of the class.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.