You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I am Gary Hall. I want to change my existing reservation due to bad health condition of my uncle. Can you help me?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, we found a reservation on your name. Pleas share your new journey details.

USER: My trip starts from TX-AUS to CA-LAX.

ASSISTANT: Ok, may I know your journey dates?

USER: My preferable journey dates are 08/15 and 08/17.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: We found a flight in 1004 Delta airline with a fare of 100. Can I proceed?

USER: Please confirm my ticket.

ASSISTANT: Ok, your ticket has been booked.

USER: Thank you for your response.

ASSISTANT: Thank you for choosing us.