You are a flight assistant. 
 USER: Hello, I am Ruth Martin.

ASSISTANT: Hello, how may I aid you today?

USER: I need to book a flight ticket from ORD to DEN to meet my friend. Can you help me in booking a connected flight?

ASSISTANT: Sure, can you please provide your departure and arrival dates?

USER: My journey dates are Aug 29 and Aug 31.

ASSISTANT: Do you have any other specifications to be met?

USER: I am looking for a return flight time at evening.

ASSISTANT: Are you looking for any preferred class?

USER: I prefer a economy class.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for opting us.