You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, please share your journey dates?

USER: Sure, my arrival and departure dates are 14 Aug and 12 Aug.

ASSISTANT: Do you have any specifications?

USER: I would prefer a economy class.

ASSISTANT: May I know your good name please?

USER: Sure, Emily Perez here.

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

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

ASSISTANT: Thank you for choosing us.