You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: Can you aid me to change my existing reservation?

ASSISTANT: Sure, I am perky to help you. May I know your good name?

USER: Jack Jones.

ASSISTANT: We found a reservation on your name to change please let me know your trip dates.

USER: My airport codes are SEA to DEN and my trip dates are June 2 and June 4 respectively.

ASSISTANT: Is there any other specifications for you?

USER: Make sure that connection limit is 1.

ASSISTANT: Thanks for providing details, no flights are available on your journey routes.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for availing us.