You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ruth Parker.

ASSISTANT: How can I assist you at this moment?

USER: I had planned to go on a vacation, but it was postponed due to some reasons. Can you change my recent reservation?

ASSISTANT: Sure, wait a moment please. Let me check the database and get back to you.

USER: Ok, take your time.

ASSISTANT: I have found your reservation in our database, can you please provide your airport codes of travelling?

USER: I want to travel from SFO to CLT.

ASSISTANT: May I know your preferable journey dates to proceed further?

USER: I would like to fly on 12/15 and 12/17.

ASSISTANT: AA airlines is available on this route with a ticket fare of 100, shall I book your ticket?

USER: Yes, proceed to booking.

ASSISTANT: Ruth Parker, your ticket is confirmed with flight number 1004.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing our service, have a safe journey.