You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Could you please book a ticket from SEA to LAX.

ASSISTANT: Sure, please share your journey dates?

USER: Departure is by Aug, 21 and return date is Aug, 23.

ASSISTANT: Do you have any specifications?

USER: I would like to return in the afternoon.

ASSISTANT: May I know your good name?

USER: My name is Joshua Clark.

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

USER: Thanks.

ASSISTANT: Thank you for choosing us.