You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you help me to book a flight from IAD to LAS?

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

USER: My planned travelling dates are Nov 28 and 30.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight.

ASSISTANT: Do you have any preferences?

USER: No.

ASSISTANT: I have found an economy class ticket with a price of 100 and 1 connecting flight.

USER: Proceed with booking under my name Carol Lopez.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for contacting us.