You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you at this moment?

USER: I want to change my existing reservation due to some health issues, can you help me with that?

ASSISTANT: Sure, may I know your good name please?

USER: My name is Kevin Garcia.

ASSISTANT: We found existing reservation on your name. can  you please help me with providing your new travelling dates?

USER: My travel dates are Aug 22 and Aug 24.

ASSISTANT: Ok, please share your airport codes.

USER: My airport codes are OAK and DFW.

ASSISTANT: Ok, do you need any break in between the journey?

USER: I prefer connecting flight on this route.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: We found a Frontier airline with fare of 200 and a break in between the journey.

USER: Please proceed to book my flight ticket in this airlines.

ASSISTANT: Your ticket has been confirmed with flight number 1024.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.