You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to spend some more days with my mother, please help me in changing my existing reservation.

ASSISTANT: Ok, please provide me your name to check the reservation status.

USER: Sure, my name is William Adams.

ASSISTANT: Please provide me your journey dates.

USER: My journey dates are 03/25 and 03/27.

ASSISTANT: May I know your airport codes please?

USER: My airport codes are EWR and LAS.

ASSISTANT: Please give me a minute.

USER: Sure, please check the flight with 0 connection.

ASSISTANT: I found a flight in Spirit airlines with price 200 and 0 connection. Shall I book the ticket for you?

USER: Ok, please proceed with my booking.

ASSISTANT: Your ticket is confirmed and the flight number is 1017.

USER: Thank you for your help.

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