You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you now?

USER: I would like to change my existing reservation due to some health issues, can you help me with this?

ASSISTANT: Sure, I am happy to help you. May I know your name to check your reservation status?

USER: Thank you. I am Larry Harris.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: We have found a reservation on your name. May I know your airport codes, please?

USER: My airport codes are from DCA to OAK?

ASSISTANT: Let me know your travelling dates, please.

USER: My trip dates are June 26 and June 28.

ASSISTANT: Do you have any connecting limit?

USER: I prefer a connecting flight.

ASSISTANT: Let me know about your other specifications.

USER: I do not have any other specifications.

ASSISTANT: Ok, please wait for  awhile.

USER: Sure.

ASSISTANT: JetBlue airlines is providing you the connecting flight in economy class, shall I reserve it?

USER: Proceed for booking.

ASSISTANT: Your ticket has been reserved with flight 1000.

USER: Thank you for booking.

ASSISTANT: My pleasure.