You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Melissa Smith.

ASSISTANT: How can I help you?

USER: I would like to change my reservation, could you help me out?

ASSISTANT: Yes, I can help you. I have found reservation on your name. Can you share me your dates of travel?

USER: My preferable dates are 11/09 and 11/11.

ASSISTANT: Ok, can I know your nearest airport codes?

USER: My airport codes are from 11/09 to 11/11. My airport codes are OAK and SFO respectively.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: I have found a flight ticket with a price of 200 and 1 connection.

USER: Please proceed with the booking.

ASSISTANT: Ok, your ticket has been booked.

USER: Thank you for your for your help.

ASSISTANT: Thank you for reaching our agency.