You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Mary Mitchell here.

ASSISTANT: How can I aid you at this moment?

USER: My airport codes for boarding the flight are DCA to LAS. Can you reserve a flight ticket to Las Vegas?

ASSISTANT: Sure, I am glad to help you in booking the flight ticket. May I know your planned travel dates?

USER: The price limit is less than 5000.

ASSISTANT: Ok, please wait for a while.

USER: My preferable dates for travel are 07/12 to 07/14.

ASSISTANT: Thank you for waiting.

USER: Thank you.

ASSISTANT: Here, I found a flight with 1 connection and airfare is about 100. Shall I proceed in booking?

USER: I am fine with the airlines. You can proceed for the booking.

ASSISTANT: Your ticket has been confirmed for the flight 1002 in Delta airlines.

USER: Thank you.

ASSISTANT: Thank you for your service.