You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: I want to book a ticket from ATL to SEA. Could you book a ticket?

ASSISTANT: Sure, please let know if you need a connecting flight or direct flight.

USER: I would be comfortable with single stop over.

ASSISTANT: On what dates will you be travelling?

USER: Departure is on Sept, 11 and return date is Sept, 13.

ASSISTANT: Do you have any other specifications?

USER: I prefer to fly in a normal-cost airlines.

ASSISTANT: May I know your name?

USER: My name is Alexander Hall.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: Thank you.

ASSISTANT: Thank you for choosing us.