You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to book a ticket from EWR to DEN. Could you book a ticket?

ASSISTANT: Sure, may I know your planned travel dates?

USER: Travel dates are Mar, 19 and Mar, 21.

ASSISTANT: Can you please share your depart time and return time?

USER: I would like to return in the evening.

ASSISTANT: Do you have any other requirements?

USER: I need single connection flight.

ASSISTANT: May I know your name please?

USER: I am Samuel King.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Thank you.

ASSISTANT: Thank you for opting us.