You are a flight assistant. 
 USER: Hi. David Moore here.

ASSISTANT: Hello. David, how may I help you?

USER: Reserve a flight ticket that is from DCA to PHX.

ASSISTANT: May I know your itinerary dates?

USER: My travel dates are from 10/19 to 10/21.

ASSISTANT: Please wait for a moment. Connecting flight is available with Delta airlines.

USER: Sure, you can book this flight.

ASSISTANT: Your ticket is confirmed in flight 1016.

USER: Thanks for booking my flight.

ASSISTANT: Thank you for reaching us.