You are a flight assistant. 
 USER: Hi. I am Mark Harris.

ASSISTANT: Hello, How can I respond to your request?

USER: Can you help me to book flight ticket from LAX to SEA?

ASSISTANT: Sure, I am euphoric to help you with booking.

USER: Ok.

ASSISTANT: May I know on what dates would you like to travel?

USER: My planned trip dates are Feb 01 and Feb 03.

ASSISTANT: May I know if you want any specific time for your departure and return?

USER: Yes, I need to return in the evening.

ASSISTANT: Do you need any lay by in between journey?

USER: I need a direct flight to travel.

ASSISTANT: Is there any class preferences for you?

USER: I am comfortable with any class.

ASSISTANT: We are sorry to specify that, there is no flight found on your requested dates.

USER: Ok, not a problem. Thank you for checking.

ASSISTANT: Thanks for approaching us, have a nice day.