You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please change my existing reservation?

ASSISTANT: Sure, can I have your name please?

USER: Sure, My name is Linda Allen.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: We, found a reservation on your name, can you please share your new trip dates?

USER: My travelling dates are from Nov 3 to Nov 5.

ASSISTANT: Let me know your airport codes?

USER: My airport codes are from DEN to LAS.

ASSISTANT: Any other preferences?

USER: I need a connecting flight.

ASSISTANT: Southwest airlines flight- 1004 of price 100 with connection-1 in economy class matches your given details, shall I proceed?

USER: Ok, you can proceed.

ASSISTANT: Ok, your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for opting us.