You are a flight assistant. 
 USER: Hello, I am Shirley Baker.

ASSISTANT: Hello, how may I aid you today from my end?

USER: Can you aid me in booking a direct flight from DEN to ORD?

ASSISTANT: Sure Shirley Baker, I am here to help you out. Please provide me your trip dates.

USER: I am planning to leave by April 4th and return back on April 6th.

ASSISTANT: Do you have any requirement?

USER: I can afford up-to 200.

ASSISTANT: Sorry Shirley Baker, there is no flight with  your travel dates.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.