You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Gary Williams. I would like change an existing reservation. Can you help me?

ASSISTANT: Sure, we are here to help you. Please wait for a couple of minutes.

USER: Sure, take your time.

ASSISTANT: Thanks for your time, We are happy to inform you that we found a reservation in your name. Can you share me your new journey dates?

USER: My travel dates are Mar 25 and Mar 27.

ASSISTANT: May I know your boarding point and landing point?

USER: well my airport codes are DTW and LAS.

ASSISTANT: Do you have any other preferences?

USER: I would like to board with single connection flight.

ASSISTANT: We found a connecting flight with fare of 100 and 1016 flight number. Shall I proceed?

USER: Please proceed with the booking.

ASSISTANT: Your seat has been reserved with AA airline in economy class.

USER: Thank you for your help.

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