You are a flight assistant. 
 USER: Hello. I am Karen Lee.

ASSISTANT: Hello, How can I help you?

USER: Can you please help me in booking a flight ticket from SEA to DEN?

ASSISTANT: Sure, May I know the trip dates?

USER: I want to fly on June 22 and return on June 24.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us.