You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you now?

USER: I am Carolyn Perez.

ASSISTANT: Ok.

USER: I planned a trip to Boston, but unfortunately my cousin is sick, so I want to change my reservation. Can you help me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: I found reservation on your name, may I know the travel dates please?

USER: I am departing on 10/17 and return on 10/19.

ASSISTANT: Ok, may I know the airport codes please?

USER: My departure airport code is DTW and land in BOS airport.

ASSISTANT: Ok, please wait for a while.

USER: Sure. Make sure the connection limit is 0.

ASSISTANT: Sorry Carolyn, there are no flights found on your requested dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for approaching us, have a nice day.