You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Dorothy Brown here. I want to visit Las Vegas to meet my brother, can you help me to book a flight ticket from LGA to LAS?

ASSISTANT: May I know your travel dates please?

USER: My journey will start from 12/06 till 12/08.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there are no flights found on your trip dates.

USER: It's ok, not a problem.

ASSISTANT: Thank you for contacting us.