You are a flight assistant. 
 USER: Hi,. I am Linda Hall.

ASSISTANT: Hello, how may I assist you now?

USER: Can you please book a flight ticket from DCA to LAS?

ASSISTANT: Sure, please share me your planned journey dates?

USER: My travel dates are 08/25 - 08/27.

ASSISTANT: Do you need any halt in between the journey?

USER: I need a connecting flight.

ASSISTANT: Thank you for the details, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no flight available on your given data.

USER: Thank you.

ASSISTANT: Thank you for reaching us.