You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: This is Mark Smith from Oakland. I am one of the best hacker in my company, so I got a call from my head office to come there.

ASSISTANT: Ok.

USER: Assist me to book a ticket to Las Vegas, LAS on 12/14 with 1 connection.

ASSISTANT: Sure, can you share your another airport code along with journey date?

USER: I have to return on 12/16 to reach the Oaklnad, OAK.

ASSISTANT: Do you have any specifications?

USER: Connection is to be 1 with price 1000.

ASSISTANT: There is a connecting flight with number 1001 in airline UA, the fare is 100.

USER: Please book it.

ASSISTANT: Your ticket is reserved.

USER: Thank you.

ASSISTANT: Thank you for reaching us.