You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Frank Lee. I want to book a ticket from EWR to LAS, can you help me to make a reservation?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: My travelling dates are on Oct 14 and Oct 16.

ASSISTANT: Please give me a moment.

USER: Sure, can you find a flight with normal cost?

ASSISTANT: Sorry, no flights are available on your route.

USER: Ok, thank you for informing me.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.