You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jason Miller.

ASSISTANT: How may I help you?

USER: I want to book a ticket from LAS -IAD to attend a office seminar, can you please help me in ticket booking?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are 05/15 to 05/17.

ASSISTANT: Do you have any requirements?

USER: I want direct flight only.

ASSISTANT: Sorry to say, no flight is available for you.

USER: No issues, thank you for your response.

ASSISTANT: Thank you for reaching us.