You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to book a  direct flight ticket to attend an emergency case at FL. Can you help me?

ASSISTANT: Sure. I can do that for you. May I know your name?

USER: Scott Davis.

ASSISTANT: Thank you. Is there any class preference?

USER: No.

ASSISTANT: Ok, may I know your travel dates?

USER: 07/23 and 07/25 are my travelling dates.

ASSISTANT: Sure, may I know your origin and destination airport codes?

USER: LAS and MCO are my airport codes.

ASSISTANT: Thank you. Please wait, let me check.

USER: Ok.

ASSISTANT: I am sorry, there is no flight available as per your requirements.

USER: No issue. Thank you.

ASSISTANT: You are welcome.