You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am David Brown. Can you please help me in booking my flight ticket from LAS to SEA?

ASSISTANT: Sure, I am here to help you. Could you please share your travelling dates?

USER: My travelling dates are 05/16 and 5/18.

ASSISTANT: Do you have any requirements?

USER: I need single connection flight.

ASSISTANT: Thank you for your details.

USER: Most welcome.

ASSISTANT: Sorry to say, no flight is available on that dates.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for reaching us, have a nice day.