You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jennifer Hernandez.

ASSISTANT: Jennifer, how may I help you?

USER: I am planning to have a round trip from Washington, can you please book me a ticket from IAD to DCA?

ASSISTANT: Sure, please provide your itinerary dates.

USER: My preferable journey dates are from 12/19 to 12/21.

ASSISTANT: Please hold on for a moment.

USER: Sure, take your own time.

ASSISTANT: Spirit airlines with flight 1014 is available on your route.

USER: Please reserve my ticket with this airlines.

ASSISTANT: Your ticket is reserved, have a safe and happy journey.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for choosing us.