You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation, as my exams have postponed suddenly. Can you please help me?

ASSISTANT: Sure, may I know your name please to check the reservation status?

USER: I am Carolyn Lopez.

ASSISTANT: Lopez, I found reservation with your details. May I know your journey dates please?

USER: My prefer to travel on 08/22 ad 08/24.

ASSISTANT: Can you provide me your airport codes?

USER: My airport codes are DCA and JFK.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: Lopez, I found a flight with JetBlue airlines available with price 100. Shall I book the ticket for you?

USER: Yes, please confirm my booking.

ASSISTANT: Your ticket is confirmed and the flight number is 1000.

USER: Thank you for your assistance.

ASSISTANT: Thank you for contacting us, have a safe journey.