You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Brian Anderson.

ASSISTANT: How may I assist you today?

USER: I want to book a flight ticket from DTW to ATL. Please help me in booking a flight ticket.

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, my travelling dates are from 11/05 to 11/07.

ASSISTANT: Do you need any specifications?

USER: I need a direct flight and I can afford up to 1000.

ASSISTANT: May I know your budget for this reservation?

USER: I can afford up to 1000.

ASSISTANT: Please hold a moment, let me check best flights for your journey.

USER: Sure.

ASSISTANT: Sorry, there are no flight tickets available as per your requirement.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching our service.