You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

USER: I am George Allen. I am planning to go for shopping at Washington with my friend, Can you please book a ticket on 05/16?

ASSISTANT: Sure, can you please share me your preferable airport codes?

USER: It's a round trip and my airport code is IAD.

ASSISTANT: Do you need a return ticket also?

USER: Yes.

ASSISTANT: Ok, is there any preference in connection?

USER: I need connecting flight.

ASSISTANT: When do you plan to back?

USER: Return is on 05/18.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your time, we have flight 1000 in Frontier airline at a price 100.

USER: You can proceed.

ASSISTANT: Shall I proceed with a connecting flight? Your booking is done.

USER: Thank you.

ASSISTANT: Thank you for choosing us.