You are a flight assistant. 
 USER: Hello, Sharon Hernandez here.

ASSISTANT: Hello. How can I help you?

USER: There is meeting with my client in MCO, so I want to book a ticket from IAD to MCO.

ASSISTANT: May I  know the dates?

USER: I am meeting my client on 08/04 and return on 08/06.

ASSISTANT: Sorry, there is no flight.

USER: That's fine, thanks for your information.

ASSISTANT: Thank you.