You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to visit CLT as my friend met with an accident, can you book a ticket from LAS?

ASSISTANT: Sure, I will help you. Please tell me your name for further process?

USER: My name is Brian Robinson.

ASSISTANT: Ok Brian, can you please provide me the travelling dates?

USER: My travel dates are 09/09 and 09/11.

ASSISTANT: Ok, please hold on for a moment.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry Brian, there are no flights available with the dates you provided.

USER: No problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for checking.