You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Benjamin Moore. I am looking for a flight from LAS to DFW, can you book the flight ticket?

ASSISTANT: Please may I know your travel dates to book?

USER: My trip dates are from 07/21 till 07/23.

ASSISTANT: Ok as per our reservation records there are no flights available. Thank you for connecting with our agency.

USER: That's ok, no problem. Thank you for your information.