You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Eric Nelson here. I want to attend a Seminar in Dallas. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, help me with the trip dates?

USER: My travelling dates are 12/27 and 12/29.

ASSISTANT: May I know your airport codes?

USER: My airport codes are SEA and DFW.

ASSISTANT: Do you have any preferences?

USER: I want to departure on afternoon. I want to travel in single connection flight.

ASSISTANT: Thank you for your information, there is a flight 1004 with a 1 drop off in United airlines and the fare of the ticket is 100 in an economy class having it's departure time in the afternoon. Is it ok for you to book the ticket?

USER: Please proceed.

ASSISTANT: Your flight ticket has been reserved.

USER: Thanks for helping me.

ASSISTANT: Thank you for reaching us.