You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Please book a flight ticket from SFO to IAH?

ASSISTANT: Can I know your journey dates?

USER: My journey dates are Apr 28 and Apr 30.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: Please let me know your name?

USER: I am Carolyn Williams.

ASSISTANT: Would you like to travel in economy class or business class?

USER: I am comfortable with any class.

ASSISTANT: I have found connecting flight with American airlines for price 100. Shall I book a ticket?

USER: Go ahead.

ASSISTANT: Your ticket is booked in an economy class having flight number 1020.

USER: Thank you for your help.

ASSISTANT: Thanks. Have a great day!.