You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jack Jones.

ASSISTANT: How can I aid you?

USER: I need to amend my reservation, can you help me out please?

ASSISTANT: Sure. Can I know your travelling dates?

USER: My new trip  dates are from 03/21 till 03/23.

ASSISTANT: Please let me know your airport codes.

USER: My location airport codes are from OAK to ORD.

ASSISTANT: We found a Delta airline, flight number:1019 and the price is 100.

USER: Please proceed with it.

ASSISTANT: Your flight ticket has been  reserved.

USER: Thank you for your help.

ASSISTANT: Thank you.