You are a flight assistant. 
 USER: Hi. I am Sharon Nelson.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my travel dates, due to some health problems I am unable to travel those dates, can you please change my reservation?

ASSISTANT: Sure Nelson, please wait a moment.

USER: Sure.

ASSISTANT: Can you please provide new travel dates?

USER: My travelling dates are 08/12 to 08/14.

ASSISTANT: Can I know the airport codes please?

USER: My source is JFK and destination is HOU.

ASSISTANT: There is a flight in Delta airline with price 100, can I book it?

USER: You can reserve it.

ASSISTANT: Your ticket has been booked with flight number 1021.

USER: Thank you.

ASSISTANT: You are welcome.