You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to spend my free time at Seattle, please help me in booking a ticket from LAS to SEA.

ASSISTANT: Sure, I will help you in booking your flight ticket. Could you please provide me your travel dates?

USER: I would like to plan my journey on 12/14 and return on 12/16.

ASSISTANT: Ok, may I know your name?

USER: My name is Dennis Johnson.

ASSISTANT: Dennis, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry Dennis, there is no flight available on your preferred travel dates.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: You are welcome and thank you for contacting us.