You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I amend you?

USER: I would like to go for a hummer tour with my friends. So, please book a flight on 03/19.

ASSISTANT: Sure, we are happy to help you.

USER: Thank you.

ASSISTANT: Can you please provide your source and destination points?

USER: Philadelphia, PHL is my origin. Las Vegas, LAS is destination.

ASSISTANT: Ok, May I know your return date?

USER: I planned to arrive on 03/21.

ASSISTANT: Ok, Do you prefer a direct flight or a connected flight?

USER: I prefer to go with a direct flight.

ASSISTANT: Ok, May I know your name?

USER: I am Patricia Taylor.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for your patience, No flights were found with your given details.

USER: Ok. Thanks for the information.

ASSISTANT: Thank you for choosing us.