You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I need to buy a plane ticket. Please help me in that.

ASSISTANT: Yes, can you share me your dates of travel?

USER: My trip dates are from May, 19 to May, 21.

ASSISTANT: Can you tell me your nearest airport codes?

USER: My airport codes are IAH and CLT.

ASSISTANT: Do you have any other specifications?

USER: I need a single connecting flight.

ASSISTANT: Do you have any preferences?

USER: No.

ASSISTANT: I have found an economy class ticket with 1 connection.

USER: Please share me airline name and flight number.

ASSISTANT: Can I know your name for booking?

USER: Donna Perez.

ASSISTANT: Flight number is 1019 of UA airlines.

USER: Please proceed for booking.

ASSISTANT: Your ticket is booked.

USER: Thank you for booking.

ASSISTANT: Thank you for contacting us.