You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, I am here to help you. May I know on whose name the ticket has been reserved formerly?

USER: My name is Melissa Clark.

ASSISTANT: I found a flight on your name, may I know your new airport codes please?

USER: My airport codes are LGA and DFW.

ASSISTANT: Ok, can you please mention your travelling dates?

USER: My travelling dates are Jan 12 and Jan 14.

ASSISTANT: Ok, do you have any specifications?

USER: I need single connecting flight.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Ok, I will wait.

ASSISTANT: I found a flight for you with Spirit Airlines and it costs you 100. Shall I proceed?

USER: Please proceed for booking the flight ticket.

ASSISTANT: Your ticket has been booked with 1004 flight number.

USER: Thanks for helping me.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.