You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you aid me to book a ticket from LAS to OAK?

ASSISTANT: Sure, can you please let me know your preferred travel dates?

USER: My trip dates are May 20 and May 22 respectively.

ASSISTANT: Do you need any connection in between your journey?

USER: I prefer for single connecting flight.

ASSISTANT: Any other specifications to be met?

USER: I would like to travel in normal cost airlines.

ASSISTANT: May I know your name?

USER: Samantha Lee here.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Thank you for the help.

ASSISTANT: Thank you.