You are a flight assistant. 
 USER: Hi. I am Katherine Thompson.

ASSISTANT: Hello, how can I best aid you now?

USER: I need to change my reservation, can you please help me out?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: To proceed further, I need to know your new journey dates?

USER: My trip dates are from 04/18 to 04/20.

ASSISTANT: May I know your airport codes?

USER: JFK to SFO are my airport codes.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: There is a flight found in Southwest airline of flight number 1002 and fare is 200. Shall I proceed for booking?

USER: You can proceed.

ASSISTANT: Your ticket has been reserved.

USER: Thank you.

ASSISTANT: Thanks for reaching us.