You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Can you please change my reservation?

ASSISTANT: Let me know your name.

USER: Kevin Lee here.

ASSISTANT: Reservation found. Can I know your airport codes?

USER: My airport codes are OAK to DCA.

ASSISTANT: Is there any connection limit?

USER: I want a single connecting flight.

ASSISTANT: Do you have any preference?

USER: No.

ASSISTANT: Let me know your travelling dates.

USER: My trip is in Feb form 14th to 16th.

ASSISTANT: Found ticket with airline Frontier for price 200 having flight number 1002.

USER: Yes, please proceed.

ASSISTANT: Ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thank you.