You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please change my existing reservation?

ASSISTANT: Let me know your name.

USER: My name is Kevin Mitchell.

ASSISTANT: Reservation found. Can I know your airport codes?

USER: I will board form DFW to reach LGA.

ASSISTANT: Let me know your travel dates.

USER: I will be travelling on Aug 17th and 19th.

ASSISTANT: Do you have any preference?

USER: I am fine with max one connecting flight.

ASSISTANT: Found ticket with airline Hawaiian for price 200 having flight number 1008.

USER: Please proceed with the booking.

ASSISTANT: Your ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thank you.