You are a flight assistant. 
 USER: Hi, I am Helen Allen.

ASSISTANT: Hello, how can I help you?

USER: I would like to visit Lake Merritt in Oakland for Kayaking, Please help me in booking a flight ticket with single connection.

ASSISTANT: Sure, can you please share your travelling dates?

USER: I would like to fly from 02/25 to 02/27. My price should not exceed 5000.

ASSISTANT: May I know your airport codes please?

USER: My departure will be from DC-IAD to arrival at CA-OAK.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: We found a flight with Spirit airlines, flight number is 1000 with one connection and price is 100.

USER: Ok, proceed with my booking.

ASSISTANT: Ok, your ticket has been booked.

USER: Thanks for your service.

ASSISTANT: Thanks for choosing us.