You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you please book a flight ticket from BOS to DFW?

ASSISTANT: May I know your journey dates?

USER: Thank you. I have planned my travel dates as May 02 and May 04.

ASSISTANT: May I know your name?

USER: Sure, myself Stephanie Adams.

ASSISTANT: Do you have any other requirements?

USER: Yes, I would like to depart in evening time so please make sure that.

ASSISTANT: Sorry to say, there are no flights available for your journey.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.

ASSISTANT: Have a nice day.