You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you now?

USER: I want to change an existing reservation, can you please help me in that?

ASSISTANT: Ok, please share your name to check with your previous booking.

USER: My name is Stephen Evans.

ASSISTANT: Your reservation is found, may I know your airport codes?

USER: My airport codes are from DEN to MSP.

ASSISTANT: When are you planning to travel?

USER: My new travelling dates are from Apr 03 to Apr 05.

ASSISTANT: Do you have any requirements?

USER: I need a direct flight ticket.

ASSISTANT: Flight-1014 is available for you with 0 connection, can I book it?

USER: Sure, you can proceed for booking.

ASSISTANT: Your ticket is reserved, thank you for choosing us?

USER: Thank you.

ASSISTANT: Have a safe journey ahead.