You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Christopher Williams here. I want to book a flight ticket from LGA to HOU..

ASSISTANT: Sure, can you please share your travelling dates?

USER: My trip dates are Jan 11 to 13.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight in afternoon time.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Ok, no problem. I will choose alternate way to reach my destination. Thank you for checking.

ASSISTANT: Thank you for reaching us.