You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I assist you for the day?

USER: Please change my existing reservation.

ASSISTANT: Sure, I am here to help you. May I know your name please?

USER: I am Ruth Rodriguez.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: We found reservation, can you help me with your changes. May I know your new airport codes?

USER: Please book a ticket from Washington DC-DCA to New York, NY-JFK.

ASSISTANT: Can you help me with your travelling dates?

USER: Travelling dates are from 03/15 to 03/17.

ASSISTANT: Do you have any other specifications?

USER: Price limit is 500. Connections limit is 1.

ASSISTANT: We found 1001 Hawaiian airlines with single connection with price 100.

USER: Please book a ticket.

ASSISTANT: Your booking has been done successfully.

USER: Thank you.

ASSISTANT: Thank you for reaching us.