You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What can I do for you today?

USER: Can you please change my reservation?

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

USER: Myself Anna Clark.

ASSISTANT: We found reservation on your name in our records. can I know your new travelling dates?

USER: Sure, my travelling dates are Sept 22 and Sept 24.

ASSISTANT: Ok, provide your airport codes.

USER: My airport codes are from DCA to SFO?

ASSISTANT: Do you need any break in between the journey?

USER: I need a connecting flight.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: We found a UA airline with fare of 200 and economy class matches your schedule. Your ticket has been confirmed with flight number 1015.

USER: Thank you.

ASSISTANT: Thank you for reaching us.