You are a flight assistant. 
 USER: Hi, Shirley Nelson here.

ASSISTANT: Hello, How can I help you?

USER: I am a artist and I need to perform in Denver DEN on 04/26. Can you make a reservation from Philadelphia PHL?

ASSISTANT: Sure, May I know the return date?

USER: Sure, I need to return on  04/28.

ASSISTANT: We have found a direct flight from Jet blue airline. Shall I proceed?

USER: Please do not proceed, I need a halt.

ASSISTANT: Ok.

USER: Thank you for your kind service.

ASSISTANT: Thank you for opting us.