You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Katherine Carter. I am taking my brother to Orlando-MCO Zoo this weekend, so I want to book a ticket from Las vegas-LAS.

ASSISTANT: Ok, can you share me your dates of travelling?

USER: We are departing on 11/12 and return on 11/14.

ASSISTANT: Ok, give me a second.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found based on your requirement.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.