You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I address you?

USER: Can you aid me in booking flight ticket from San Francisco, SFO within the airfare 500?

ASSISTANT: Sure, may I know your destination code?

USER: Detroit, DTW is my landing point..

ASSISTANT: Kindly share your travelling dates.

USER: Ok, I am available to board on 11/14 and return on 11/16.

ASSISTANT: Let me know your good name.

USER: William Turner, is my name.

ASSISTANT: Please wait for a minute, I will get back to you.

USER: Sure.

ASSISTANT:  There is no flight with your respective dates of travel.

USER: Ok, thanks for your effort.

ASSISTANT: Thanks for availing us.