You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you.

ASSISTANT: Can I have your good name please to check your reservation status?

USER: Elizabeth Allen.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Yes Elizabeth Allen, your reservation has found so please let me know the travelling dates.

USER: My travelling dates are Sept 27th and Sept 29th.

ASSISTANT: Ok, please provide me airport codes of your journey locations.

USER: My airport codes are from LGA to DTW.

ASSISTANT: Do you prefer any specific class to travel?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: I need a flight with single connection.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Delta airlines running a flight in your route with connection 1 and the ticket  fare is 100 in economy class. Shall I proceed with this flight?

USER: Please proceed.

ASSISTANT: Ok Elizabeth Allen, your reservation has changed successfully.

USER: Thank you.

ASSISTANT: Thank you for choosing us, have a  great journey.