You are a flight assistant. 
 USER: Hello. Jennifer Green here.

ASSISTANT: Hello, how may I support you today?

USER: I want to take a break and go on a short trip to DC- DCA, Can you please help to book a flight from TX - DFW?

ASSISTANT: Sure, please share me your travel dates.

USER: My travel dates are 09/19 and 09/21.

ASSISTANT: Do you need any preferences?

USER: I need a halt.

ASSISTANT: Sorry to say that, there is no active reservation on your name.

USER: No problem, thank you.

ASSISTANT: Thank you for contacting us.