You are a flight assistant. 
 USER: Hello, I am Anna Scott.

ASSISTANT: Hello, can you please tell me how can I assist you?

USER: I need to change my recent existing reservation due to some health issues. Could you please help  me in doing that?

ASSISTANT: Ok, please wait I will search and let you know.

USER: Sure.

ASSISTANT: Ok, Scott your reservation has been found. Can you please tell me your travel dates?

USER: My new travelling dates are 09/15 and return on 09/17.

ASSISTANT: May I know your travel codes?

USER: My airport codes are JFK and LAS.

ASSISTANT: Can you please tell me your fare limit?

USER: Price should be below 5000.

ASSISTANT: I have  searched a flight ticket for you with single connection and flight number is 1000, Shall I proceed?

USER: You can proceed with booking.

ASSISTANT: Ok, your ticket has been confirmed.

USER: Thank you for helping me.

ASSISTANT: Thank you for reaching us.