You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Gregory Parker.

ASSISTANT: How can I assist you?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: I found your reservation, can I know the travel dates please?

USER: I want to travel on 05/27, and return on 05/29.

ASSISTANT: Could you please provide the airport codes?

USER:  I need to leave from my nearest airport JFK to reach IAD.

ASSISTANT: May I know the departure and return time?

USER: I need to return in the evening time.

ASSISTANT: Do you have any requirements?

USER: I need a connecting flight.

ASSISTANT: There is a direct flight in UA airline with price 100, can I proceed with this?

USER: Ok, proceed with the booking.

ASSISTANT: Your reservation has been change with the flight number 1014.

USER: Thanks for the help.

ASSISTANT: Thank you for approaching us.