You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you help me to change my recent reservation?

ASSISTANT: Sure, may I know your name please?

USER: Barbara Carter here.

ASSISTANT: We found a reservation on your name, can you please share me your new travel details?

USER: Apr, 21 and Apr, 23 are my travel dates.

ASSISTANT: Where do you want to travel?

USER: I want to depart from DCA to IAD.

ASSISTANT: Do you prefer any additional specifications?

USER: I need a connecting flight.

ASSISTANT: Barbara Carter, we have found a flight on your new details with Frontier Airlines, flight number: 1000. Shall I proceed next step?

USER: Please go ahead.

ASSISTANT: Ok. Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you so much for communicating us.