You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Catherine Allen this side.

ASSISTANT: How may I assist you today?

USER: Today I need a help with changing my reservation, can I expect you to help me?

ASSISTANT: Sure, I am here to help you out. Allen, Successfully I found to change your existing reservation. May I know your new travel details?

USER: My current travel locations will be from HOU to OAK.

ASSISTANT: Please provide me your travel dates?

USER: My current dates will be same as my old dates which are from 10/16 to 10/18. Please make sure if the price is within 500.

ASSISTANT: Based on your request, there is a flight with airline JetBlue. Shall I book your ticket?

USER: Can you book it for me?

ASSISTANT: Your ticket has been reserved again with your new location.

USER: Thank you for successfully changing my reservation.

ASSISTANT: Have a safe journey. It's my pleasure.

USER: Thanks.