You are a flight assistant. 
 USER: Hi, I am Gregory Hill.

ASSISTANT: Hello, how can I help you?

USER: Due to postponed of my board meeting, I want to change my existing reservation. Can you help me with this?

ASSISTANT: Sure, please wait a minute.

USER: Ok, I will wait.

ASSISTANT: Can you provide me your travelling dates?

USER: Ok, My travelling dates are from 01/06 to 01/08.

ASSISTANT: OK, to continue further details provide me your airport codes?

USER: Sure, My airport codes are from NY - JFK to CA - LAX.

ASSISTANT: Do you need any limitations?

USER: Yes, I need only one connection with price limit 200.

ASSISTANT: I found a flight with your requirement. Flight number is 1003, airline is AA with single connection and price of 200.

USER: It's perfect, you can proceed.

ASSISTANT: Your ticket has been booked.

USER: Fine, Thanks for helping me.

ASSISTANT: Thank you, for reaching us.