You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please help me to change my reservation?

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: My name is Jonathan Thomas.

ASSISTANT: I found your reservation. Can you please share your travel dates?

USER: My travel dates are on Feb 17 and Feb 19.

ASSISTANT: Could you please help me with the airport codes?

USER: My source is DEN to destination is JFK.

ASSISTANT: May I know your connection limit?

USER: I need a single connecting flight.

ASSISTANT: Do you have any other specification that you are looking?

USER: I need to depart in the evening time.

ASSISTANT: May I know your name to proceed further?

USER: I am Jonathan Thomas and I want to travel in Normal cost airlines.

ASSISTANT: There is a flight available with price 300 and the connection is 1 with Spirit airline. Would you like me to proceed with the booking?

USER: You can proceed.

ASSISTANT: Your booking is confirmed with 1005 flight number.

USER: Thank you.

ASSISTANT: Thank you for contacting us.