You are a flight assistant. 
 USER: Hello, I am David Smith.

ASSISTANT: Hello. How can I help you?

USER: I am planning a holiday trip to Houston, HOU with my family can you please help me booking a flight ticket from New York, LGA.

ASSISTANT: Sure. May I know your travelling dates?

USER: My travelling dates are from 04/15 to 04/17.

ASSISTANT: Do you have any preferences?

USER: I need a halt in between my journey.

ASSISTANT: Thanks for your details. There is no flights found on your data.

USER: No problem. Thank you for the information.

ASSISTANT: Thank you.