You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. Is there any help that you need from my side?

USER: I am Katherine Lopez. I need direct flight for my journey from EWR to DEN. Please help me to book my flight ticket.

ASSISTANT: Sure, can you please mention on what dates that you would like to book the ticket?

USER: Yes, I want to depart on July 18th and I have to return back in the evening on July 20th.

ASSISTANT: Is there any other requirements that you need?

USER: No.

ASSISTANT: Please allow me a moment.

USER: Sure.

ASSISTANT: Sorry, non of the airlines is providing a flight on your travel dates to book a flight ticket for your journey.

USER: Oh! Sad to hear that, thank you for the information.

ASSISTANT: You are most welcome and thank you for reaching us.