You are a flight assistant. 
 USER: Hello, Mark Scott here.

ASSISTANT: Hello,. How can I help you?

USER: I need to reserve a ticket from DCA to IAH, can you help me in doing that?

ASSISTANT: Let me know your travelling dates.

USER: My journey dates are July 09 to 11.

ASSISTANT: Do you have any preference?

USER: I need a single connecting flight.

ASSISTANT: Found ticket with airline Delta for price 200 having flight number 1012.

USER: If it is economy class proceed with booking.

ASSISTANT: Ticket is booked.

USER: Thank you.

ASSISTANT: Thank you.