You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Virginia Davis.

ASSISTANT: How can I help you?

USER: I am looking to book a flight ticket to meet my friend in Denver, can you help me for booking a flight ticket from LAS to DEN?

ASSISTANT: Can I know your travelling dates?

USER: My travelling dates are Oct 26 and Oct 28.

ASSISTANT: Do you have any preference?

USER: I prefer normal cost airline.

ASSISTANT: Connecting flight can be booked with airline Hawaiian for price 100 having flight number 1017. Shall I book a ticket?

USER: If my return flight is in morning time, please proceed for booking.

ASSISTANT: Sorry, no flights found.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you.

USER: Welcome.