You are a flight assistant. 
 USER: Hello, I am Brenda Roberts.

ASSISTANT: Hello, how can I guide you today?

USER: I want to book a direct flight to Seattle, SEA to meet my childhood friend. Can you please book a ticket from LAS?

ASSISTANT: Sure, Can you please provide your travelling dates?

USER: My travelling dates are Nov 18 and Nov 20.

ASSISTANT: Ok, Is there any stopover in between your journey?

USER: I have already mentioned.

ASSISTANT: Ok, May I know your class preference?

USER: I am comfortable with any class.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: My return time is morning.

ASSISTANT: Ok, please standby.

USER: Ok.

ASSISTANT: We regret to inform you that, there are no flights moving to your region with your planned dates of travelling.

USER: Ok, no worries. Thank you.

ASSISTANT: Thank you for availing us.