You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Actually my final examination is postponed so that I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, may I know your name please?

USER: Sure, I am Janet Rodriguez.

ASSISTANT: May I know your airport codes please?

USER: Ok, my source code is DTW and the destination code is OAK.

ASSISTANT: Your travel dates please?

USER: Ok, my planned trip dates are on 10/06 and return on 10/08.

ASSISTANT: There is a flight with single connection, can I change your reservation to Frontier airlines?

USER: I want a direct flight, can you check with that?

ASSISTANT: I am sorry no direct flight found on your route.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.