You are a flight assistant. 
 USER: Hi. I am Lisa Lee.

ASSISTANT: Hello. How may I support you today?

USER: I want to book a flight ticket from NV-LAS to MA-BOS. Can you help me?

ASSISTANT: Sure, we are gleeful to assist you in booking.

USER: Thank you.

ASSISTANT: Please let me know if you need a connecting flight.

USER: I need a break.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: I would like to depart in the afternoon.

ASSISTANT: Is there any another specifications?

USER: No.

ASSISTANT: Kindly share your planned travelling dates to proceed further.

USER: Aug 04th and 06th are my travelling dates.

ASSISTANT: Ok, please wait a while.

USER: Ok.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: No issue. Thank you for the information.

ASSISTANT: Thank you for approaching us.