You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to change my existing reservation, due to some health issue. Can you please help me out?

ASSISTANT: Let me know your name.

USER: My name is Gary Lee.

ASSISTANT: There is a reservation on your name. Can I know your travelling dates?

USER: My travelling dates are Nov 10 and Nov 12.

ASSISTANT: Do you have any preference?

USER: I need a connecting flight.

ASSISTANT: Let me know your airport codes.

USER: My travelling airport codes are MSP to EWR.

ASSISTANT: Found ticket with United airlines for price 100 having flight number 1024.

USER: Please proceed.

ASSISTANT: Ticket is booked.

USER: Thank you for booking.

ASSISTANT: Thank you.