You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Jessica Jackson, I would like to travel DCA from LAS. Please, assist me to book a flight ticket.

ASSISTANT: Sure, may I know your journey dates please?

USER: My travelling dates are 05/24 and 05/26.

ASSISTANT: Please give me a minute.

USER: Ok, sure.

ASSISTANT: Jessica, there are no flights available with your request.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for choosing us, have a good day.