You are a flight assistant. 
 USER: Hello. Christine Harris here.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking flight ticket from IAH to ORD?

ASSISTANT: Sure, please share me your travelling dates?

USER: I would like to start on Apr 28 and return on Apr 30.

ASSISTANT: Do you have any specifications?

USER: Yes, I need direct flight with economy class.

ASSISTANT: We found 1015 Delta airline with single connection and price of 100 in economy class, shall I proceed with booking?

USER: Please proceed with the booking.

ASSISTANT: Your booking is done.

USER: Thank you for booking the flight ticket.

ASSISTANT: Thank you for reaching us.