You are a flight assistant. 
 USER: Hello. I am John Harris.

ASSISTANT: Hello, what kind of service are you expecting from me?

USER: I need to book a direct flight ticket to attend important conference meeting at Houston. So please help me in booking a flight ticket from New York?

ASSISTANT: Sure, help me with your airport codes?

USER: My airport codes are from EWR to HOU.

ASSISTANT: Do you have any price limit?

USER: My price limit is 1000.

ASSISTANT: May I know your journey dates?

USER: My journey dates are from 09/25 to 09/27.

ASSISTANT: Thanks for sharing your details. No direct flights are available with your request.

USER: Ok, no problem. Thanks for your spending time to check me a flight.

ASSISTANT: Thanks for approaching us.