You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Andrew Davis. I planned to meet my cousin in SEA, can you please help me to book a flight ticket from DCA?

ASSISTANT: Sure, I am here to help you in booking. Can I have your travel dates?

USER: I prefer to travel on May 22 and May 24.

ASSISTANT: Do you have any specification?

USER: I would like to depart in afternoon.

ASSISTANT: We found a flight 1000 in Southwest airlines with 1 stopover and it costs you 100. Can I proceed?

USER: Ok, please confirm my booking.

ASSISTANT: Your booking is done.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.