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

ASSISTANT: Hello, can I assist you?

USER: Can you please book a flight ticket to New York, JFK as I want attend  a meeting?

ASSISTANT: Ok, let me know your travel dates.

USER: I want to travel on 08/29 to 08/31.

ASSISTANT: Ok, can you share your other airport code?

USER: My source point is Houston, HOU.

ASSISTANT: Thanks for your details. Sorry, there is no flight on your required dates.

USER: It's ok, thank you for the information.

ASSISTANT: Thanks for picking us.