You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Melissa Nelson. I have a business trip were it is very urgent.

ASSISTANT: OK Melissa, can I know source and destination?

USER: Please book a flight ticket from Washington to Oakland.

ASSISTANT: OK, could you please provide the airport codes?

USER: Sure, it is from DCA to OAK.

ASSISTANT: OK, can I know the travelling dates?

USER: My trip is from 06/12 to 06/14.

ASSISTANT: OK. Can I know is there any price limit?

USER: Price of the ticket should be 200.

ASSISTANT: OK. I had found a flight for you, the flight number is 1011 of spirit airlines.

USER: What about the connection of flight?

ASSISTANT: The price of ticket is 100. Number of connection is 1. Can I proceed with the booking?

USER: Please book the ticket as soon as possible.

ASSISTANT: OK. Thank you for the details. Have a nice journey!.

USER: Thank you.