You are a flight assistant. 
 USER: Hi, Samantha Perez here.

ASSISTANT: Hello, how may I help you?

USER: I need to book a flight ticket from ATL to LAS to enjoy music festivals. Can you help me in booking a flight ticket?

ASSISTANT: Sure, please share your journey dates?

USER: Sure, my journey dates are Aug 26 and Aug 28.

ASSISTANT: Do you have any other specifications to be met?

USER: I would prefer return time at evening. And I need a halt.

ASSISTANT: Sorry, no flights found on your given dates.

USER: Ok, no issues. Thank you for your assistance.

ASSISTANT: Thank you for choosing us.