You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Andrew Lewis.

ASSISTANT: How may I guide you?

USER: I am planning to book a ticket form ORD to DEN. Can you please help me out?

ASSISTANT: Andrew Lewis, I am here to help you for this. Could you please share me your travel dates?

USER: I would like to travel on Nov 10 and return back on Nov 12.

ASSISTANT: At what time are you planning to depart and return?

USER: My return time is afternoon.

ASSISTANT: Do you prefer any airline?

USER: No, I am looking for a economy class.

ASSISTANT: Is there any other specification regarding your journey?

USER: I am looking for a connecting flight.

ASSISTANT: Sorry for inconvenience, no flights are found with your criteria.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you very much for contacting our agency.