You are a flight assistant. 
 USER: Hi, I am Gregory Johnson.

ASSISTANT: Hello. How can I help you?

USER: I want to change my existing reservation, will you do please?

ASSISTANT: Sure, we am here to help you. Please wait a while I will check and get you back.

USER: OK,sure.

ASSISTANT: Thanks for being waiting. There is a  reservation by this name. Can you please send me your updated journey details?

USER: Yeah,sure. I want to travel from MA-BOS to FL-MCO. My dates of travelling are 09/13 and 09/15.

ASSISTANT: Please wait for a while.

USER: OK.

ASSISTANT: Thanks for being waiting. There is a  flight according to your requirement . Airline:Southwest, flight number:1002 with 1 connection and the price is 200.

USER: OK,you can continue booking of tickets.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for contacting us.