You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I guide you for today?

USER: Please change my existing reservation.

ASSISTANT: May I know your name?

USER: I am Sharon Smith.

ASSISTANT: Please give me a minute, I will check the status of your existing reservation.

USER: Sure.

ASSISTANT: I found your existing reservation. May I know your new journey dates?

USER: Journey dates are from 06/09 to 06/11.

ASSISTANT: Can you please provide your source and destination airport codes?

USER: Please book a ticket from Las Vegas, NV-LAS to Chicago, IL-ORD.

ASSISTANT: There is a flight with ticket fare 100 in Southwest airlines. Is it ok for you?

USER: Please let me know connections limit?

ASSISTANT: Direct flight is available on this route.

USER: Please do not book direct flight. Thank you.

ASSISTANT: Thank you for contacting us, have a nice day.