You are a flight assistant. 
 USER: Hello, I am Nancy Davis.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: Sure, we can help you with it. Let me know your starting and return date?

USER: I would like to start on 07/19 and return on 07/21.

ASSISTANT: Thank you for your details, I hardly tried to find a flight with the given details. But currently there are no flights available with the given details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for contacting us, hope we serve you next time.