You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Betty Evans here.

ASSISTANT: How can I help you at this moment?

USER: Can you reserve a flight ticket to Chicago with a price below 200?

ASSISTANT: Sure, I will help you with that. Can you please mention your preferable travel dates for booking flight ticket?

USER: My preferable dates for travel are 08/04 to 08/06.

ASSISTANT: May I know your preferable airport code names for further process?

USER: My airport codes for boarding the flight are EWR to ORD.

ASSISTANT: Please hold on a moment, I will check flight availability in this route.

USER: Sure.

ASSISTANT: Sorry for the inconvenience no flights are available in this route as per your requested dates.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for contacting us, have a nice day Betty Evans.