You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Please help me to update my travelling dates in my existing reservation.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name please to check your previous reservation status?

USER: I made a reservation by this name Patrick Thomas.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Patrick Thomas, I have found your reservation. Please help me with your airport codes.

USER: My source and destination airport codes are DEN and ORD.

ASSISTANT: Can I have your planned trip dates please?

USER: I intend to depart on 01/23 and my return date will be on 01/25.

ASSISTANT: Do you have any connection preference?

USER: Make sure I need a economy class ticket.

ASSISTANT: Do you have any other specifications?

USER: I prefer to fly with the connecting flight.

ASSISTANT: I found an economy class in American Airlines with fare 100 and it has single connection. Can I book your ticket?

USER: That's perfect, you can book the ticket with this airline.

ASSISTANT: Ok, your booking is confirmed with flight number 1013.

USER: Thank you for your support in changing.

ASSISTANT: Thank you for choosing us.