You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I guide you at this moment?

USER: Donna King here. Please book me a ticket from DEN to IAD, as I need to attend a meeting.

ASSISTANT: Yes, I will help you about it. Can you please help me about your dates of journey?

USER: My travel dates are 06/07 and 06/09.

ASSISTANT: There is a flight with 1 connected flight, costs 300. Shall I proceed?

USER: Please search for a flight with ticket fare of 200.

ASSISTANT: Sorry King, there is no flight to your destination as per your required fare.

USER: That's ok, thank you for your assistance.

ASSISTANT: Thank you for opting our service. You are welcome.