You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Mary Robinson here.

ASSISTANT: How can I help you?

USER: I want to meet my ailing grandfather. Could you book my ticket in a direct flight?

ASSISTANT: Let me know your airport codes?

USER: My genesis and terminus airport codes are IAD and CLT.

ASSISTANT: Can I know your travelling dates?

USER: My itinerary dates are July 10 and July 12.

ASSISTANT: Found ticket with airline UA for price 200 having flight number 1014. Shall I book a ticket?

USER: Is it a direct flight?

ASSISTANT: It is a direct flight.

USER: Please book my ticket.

ASSISTANT: Your ticket is booked.

USER: Thank you for assisting me.

ASSISTANT: Thanks.