You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you at this moment?

USER: I am planning to go for DTW from LGA, can you please search a flight ticket for me?

ASSISTANT: Sure, can I know the travel dates please?

USER: My trip dates are 06/04 and 06/06.

ASSISTANT: May I know your name to proceed further?

USER: Myself William Campbell.

ASSISTANT: Ok, wait a moment please.

USER: Please make sure that price should be 500.

ASSISTANT: Sorry William, there are no flights with price 500.

USER: Ok, fine I will other alternative to complete my trip.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your information.

ASSISTANT: You are welcome.