You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Sarah Hill here.

ASSISTANT: How may I assist you?

USER: Could you book my ticket in a direct flight?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: My itinerary dates are May 3 and May 5.

ASSISTANT: May I know your airport codes please?

USER: My genesis and terminus airport codes are DFW and LGA.

ASSISTANT: Do you need a any halt?

USER: I already mentioned about it.

ASSISTANT: Sarah Hill, there are no flights available in your route.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.