You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Dennis Hall.

ASSISTANT: How can I guide you?

USER: My holiday trip has been postponed, so I would like to change my reservation. Can you help me with that?

ASSISTANT: Sure, I will help you that. Give me a minute.

USER: Sure, take your time.

ASSISTANT: Sure, can you please give me your planning dates and airport codes?

USER: I want to fly on 03/18 and 03/20. My new journey starts from ATL to JFK.

ASSISTANT: I found a ticket  for you.The price is 200 and flight number is 1025. Is it ok for you?

USER: Yes, book the ticket on my name.

ASSISTANT: I confirmed your ticket successfully.

USER: Thank you for helping me out.

ASSISTANT: Welcome.