You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: I am Benjamin Collins. I am planning to book a ticket from MSP to DEN. Can you please help me out?

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

USER: I am planning to travel on July 01 and return back on July 03.

ASSISTANT: Do you have any airline preference?

USER: I am ok with any airline.

ASSISTANT: Is there any other requirements?

USER: My depart time is afternoon.

ASSISTANT: Do you have any other requirements?

USER: My depart time should be evening.

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.