You are a flight assistant. 
 USER: Hello. I am Scott Thomas.

ASSISTANT: Hello, how can I help?

USER: I would like to attend Global Environmental Conference in Benaroya hall, which is at Washington. Can you book me a ticket from DEN to DCA?

ASSISTANT: Sure, please help me with your travelling dates.

USER: I would start on 03/22 and return on 03/24.

ASSISTANT: Do you have any specific preferences?

USER: I need a flight within price 5000.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: We have a connecting flight from Spirit airline, number 1024 and the price is 100. Shall I proceed?

USER: Yes, please go ahead.

ASSISTANT: Your economy class seat is reserved.

USER: Thanks for your support.

ASSISTANT: Thank you for choosing us.