You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Can you please help me to book a flight ticket?

ASSISTANT: Sure, may I know your name?

USER: Yes, myself Joshua Collins. I want to travel from LAX to DEN. In the dates of 08/11 to 08/13.

ASSISTANT: Please hold on for a moment, let me check the availability. Sorry for the inconvenience, there is no flight for the details you provided.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thanks for contacting us.Have a nice day.