You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my existing reservation, as my health is not good to travel. Can you please help me with this?

ASSISTANT: Yes, I can help you. Can I know your name for checking your reservation?

USER: I am Katherine Lee.

ASSISTANT: Ok, can I know your new travelling dates for this journey?

USER: I planned to travel on 01/12 and 01/14.

ASSISTANT: Ok, could you share me your nearest airport codes?

USER: My airport codes are EWR and IAH.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: I have found a flight ticket with a price of 100 and 1 connection. Can I proceed to booking?

USER: Yes, please confirm my booking.

ASSISTANT: Ok, your ticket is booked.

USER: Thank you for your assistance.

ASSISTANT: Thank you for reaching our agency.