You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am, Christine Scott. I want to fly from DEN to ATL, please book a flight ticket.

ASSISTANT: Sure, kindly mention your travel dates.

USER: My travelling dates are from June 2nd to June 4th.

ASSISTANT: How much can you afford for this journey?

USER: I need the ticket under price 500.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: no issues, thank you.

ASSISTANT: Thanks for reaching us.