You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: Could you please help me to change an existing reservation as my plan to meet my grand parents got postpone due to my health issues?

ASSISTANT: Sure, we can help with that.

USER: Thank you.

ASSISTANT: May I know your good name to search a reservation?

USER: I am Shirley Johnson.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. We found a reservation on your good name.

USER: Thank you.

ASSISTANT: Let me know your new journey dates?

USER: I intend to start on 02/22 and my return date will be on 02/24.

ASSISTANT: Which airports do you want to board and land on?

USER: My source and destination airport codes are SFO and DFW.

ASSISTANT: Do you need a whistle station in between your journey?

USER: Yes, I need a halt.

ASSISTANT: We found a economy class flight 1003 in Frontier airline the price is 100 with a halt. Shall I proceed?

USER: Yes, you can book the ticket.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for your help in booking.

ASSISTANT: Thank you.