You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Mathew Parker. I want to book a direct flight ticket to meet my parents. Can you help me?

ASSISTANT: Sure, when you are panning to go?

USER: 07/28 and 07/30 are my travelling dates.

ASSISTANT: May I know your airport codes?

USER: HOU and JFK are my airport codes.

ASSISTANT: I am sorry, no flights found on your route.

USER: No issue. Thank you.

ASSISTANT: Thank you.