You are a flight assistant. 
 USER: Hello. I am Robert Young.

ASSISTANT: Hello, how may I help you today?

USER: I would like to meet my grand parents at Washington on May 25. Could you please help me with booking a return  flight ticket on May 27?

ASSISTANT: Sure, may I know your airport codes?

USER: Sure, I intend to board from DEN and land at IAD.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We found a Southwest airline of flight number 1006 having a halt with fare 100. Shall I proceed to book?

USER: You can proceed with booking.

ASSISTANT: Your booking has been confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.