You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Dorothy Perez here.

ASSISTANT: How can I assist you?

USER: I would like to attend funfair exhibition in Washington, can you please help me in booking a flight ticket?

ASSISTANT: Sure, I will help you. Can you please provide me your travelling dates?

USER: My travelling dates are from 02/05 till 02/07.

ASSISTANT: Ok, may I know your travelling airport codes?

USER: My airport codes are from MCO to DCA.

ASSISTANT: Ok, give me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no flight is available for you on your route.

USER: It's ok, thank you for checking.

ASSISTANT: Welcome.