You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I need to book a ticket from DFW to EWR. Could you book a ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: Travelling dates are Oct, 12 and Oct, 14.

ASSISTANT: Do you have any other requirements?

USER: I prefer normal-cost airlines.

ASSISTANT: Do you have any specific timings?

USER: I would like to return in the afternoon.

ASSISTANT: Can I know your class preference?

USER: I am comfortable with any class preference.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: Thank you.

ASSISTANT: May I know your name for documentation purpose?

USER: My name is Brian Nelson.

ASSISTANT: Thank you for choosing us.