You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Charles Moore here. I would like to book a flight ticket from OAK to LAS. Can you please help me with booking?

ASSISTANT: Ok, may I know the travel dates to book a flight ticket?

USER: Sure, my travelling dates are from 07/19 to 07/21.

ASSISTANT: There is a connecting flight available with a price limit 100 and the airline is Frontier.

USER:  I want a direct flight in my journey, please recheck with that.

ASSISTANT: Sorry, there are no direct flights available.

USER: Not a problem, anyway, thank you for the information.

ASSISTANT: Ok, thank you for choosing our agency.

USER: Thank you for searching.