You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Lisa Lewis.

ASSISTANT: How may I serve you today?

USER: Can you please help me with booking a flight ticket from LAS to IAD?

ASSISTANT: Sure, please share your travel dates.

USER: My travel dates are 10/08 and 10/10.

ASSISTANT: Do you need a stopover?

USER: Yes, I need a stopover.

ASSISTANT: Is there any class preference do you have?

USER: No.

ASSISTANT: Do you have any specific timings for your depart and return flights?

USER: I would like to depart at afternoon.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you for approaching us.