You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Andrew Lewis. Can you help ,me to book a flight on 08/27 and 08/29?

ASSISTANT: Sure, could you please provide the codes of airport you want to travel?

USER: My preferable airport codes are DEN and OAK.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Ok, there is a flight 1010 in Delta airline matching your details with price 100. Shall I proceed?

USER: Proceed with booking.

ASSISTANT: Ok, your booking is done.

USER: Thank you for your help.

ASSISTANT: You are welcome.