You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am searching for a direct flight to my home as it's very urgent, please help me with booking a flight ticket on 04/09.

ASSISTANT: Sure, I am here to help you. May I know your airport codes please?

USER: Sure, I will start from Denver, CO-DEN and land on Las Vegas, NV-LAS.

ASSISTANT: Ok, please share your return date.

USER: Sure, I will back on 04/11.

ASSISTANT: Thank you for providing your details, sorry no flight found with you details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for availing us, have a nice day.