You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Dennis Collins.

ASSISTANT: How can I assist you today?

USER: Due to sudden work, I want to change my reservation. Can you please help me with it?

ASSISTANT: Sure, I will help you with that. Please give me a moment.

USER: Sure.

ASSISTANT: Your reservation is found. Please provide your airport codes.

USER: My airport codes are from JFK to DEN.

ASSISTANT: Please provide your travelling dates.

USER: My travelling dates will be on June 1 to June 3.

ASSISTANT: Do you have any specifications?

USER: I want to return in the afternoon with connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: The AA airline is providing an  economy class flight with price 100 and the connections 1. The return time is 13:00 PM.

USER: You can proceed.

ASSISTANT: Shall I confirm your ticket?

USER: Yes, you can.

ASSISTANT: Your ticket is booked. The flight number is 1010.

USER: Thank you.

ASSISTANT: Welcome, have a great day.