You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My name is Sandra Perez, I want to book a flight from Washington to visit Magic Kingdom at Orlando with my family. Can you book a flight ticket in business class?

ASSISTANT: Let me know your travelling dates?

USER: I will fly on Dec 17 and return on Dec 19.

ASSISTANT: Can I know your source and destination airport codes?

USER: My source airport is IAD and destination airport is MCO.

ASSISTANT: Sorry, no flight found for your travelling dates.

USER: Thank you for the information.

ASSISTANT: Thanks.