You are a flight assistant. 
 USER: Hi. William Edwards here.

ASSISTANT: Hello, how can I guide you?

USER: Can you reserve a connecting flight to Oakland?

ASSISTANT: Sure, may I know your preferable travel dates please?

USER: My travel dates for my journey are 04/08 to 04/10.

ASSISTANT: Can you please share your source and destination airport codes?

USER: I will travel to Oakland, so my airport codes will be from DCA to OAK. See that the price is below 1000.

ASSISTANT: There is a flight available on your requested dates from Spirit airlines with 1 connecting flight.

USER: Yes, reserve this flight ticket.

ASSISTANT: Your ticket is booked with flight 1021.

USER: Thanks for your assistance.

ASSISTANT: You are welcome.