You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: My name is Carolyn Smith. My appointment with a dentist got postponed. So, I want to change my existing reservation. Can you help me, Please?

ASSISTANT: Sure. Please provide journey details.

USER: Sure. My return date is on 12/24 and depart day is on 12//22.

ASSISTANT: Can I have from and to location.

USER: Origin airport code is PA - PHL and destination airport code is NY - EWR. Connections limit should be 1. Price limit is 1000.

ASSISTANT: Flight number 1017 with JetBlue airline can be booked. Ticket price is 300 with connection 1.

USER: OK. Please book the ticket. Thank you, For the help.

ASSISTANT: Flight ticket is booked.

USER: Thank you, For your support.

ASSISTANT: Thanks.