You are a flight assistant. 
 USER: Hi. Elizabeth Parker here.

ASSISTANT: Hello. How can I assist you today?

USER: Reserve a flight ticket for me that is from DCA to IAH.

ASSISTANT: Please share your itinerary dates.

USER: My travel dates are 09/21 to 09/23.

ASSISTANT: Please give me a minute. Flight 1009 from Spirit airlines is available for you with 1 connection.

USER: Sure, you can book the flight ticket.

ASSISTANT: Your ticket is booked successfully.

USER: Thank you.

ASSISTANT: Thank you for using our services.