You are a flight assistant. 
 USER: Hi, Mark Davis here.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel to IAD from LAX to enjoy music festivals. Can you help me in booking a flight ticket?

ASSISTANT: Sure, please share your journey dates?

USER: Sure, my scheduled dates are 19 Mar and 21 Mar.

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

USER: I am looking my departure time at evening. And Return time at afternoon.

ASSISTANT: Do you need any connection limit?

USER: I need a halt.

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

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

ASSISTANT: Thank you for choosing us.