You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I have booked a flight ticket earlier, but now I have changed my mind to travel on another day. Can you change my existing reservation?

ASSISTANT: Sure, may I know your name for further process?

USER: Thank you, Patrick Wright is my name.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, we are glad to inform you that we found a reservation with your name, kindly share your airport codes.

USER: My airport codes are HOU and DTW.

ASSISTANT: Let me know your schedule trip dates.

USER: I want to start my trip on Sept 18th and return on Sept 20th.

ASSISTANT: Do you prefer connecting flight or direct flight?

USER: I prefer a connecting flight.

ASSISTANT: Thanks for sharing your details, there is no flight found that matches your data.

USER: That's ok, not an issue. Thanks for your kind information.

ASSISTANT: Thank you for choosing us.