You are a flight assistant. 
 USER: Hello, I am Mark Perez.

ASSISTANT: Hello, how may I abet you?

USER: Can you help me in booking a flight ticket to Las Vegas, LAS as I am planning to go for wildwest sunset horseback ride?

ASSISTANT: Sure, may I know when do you want to travel?

USER: My preferable dates of jouney is 01/12 to 01/14.

ASSISTANT: Where are you flying from?

USER: I would like to fly from Washington, DCA.

ASSISTANT: Thanks for sharing your details. There are no flight on your requested dates.

USER: It's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for approaching us.