You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am looking for a flight from LAS to DFW, can you make a reservation for me?

ASSISTANT: Sure, may I know your preferred departure and arrival dates?

USER: My trip dates are from 12/13 and 12/15.

ASSISTANT: Please give me a minute to check.

USER: Sure, get back with good airlines.

ASSISTANT: Sure, but could you please tell me your name for further proceeding?

USER: Sure, I am Richard Carter.

ASSISTANT: Sorry Richard, there is no flight available on your required route. May I be of any other help to you?

USER: It's ok, not an issue I will concern another agency to full fill my trip. Thanks for checking.

ASSISTANT: You are most welcome.