You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Please help me to book a flight ticket from ORD to PHL.

ASSISTANT: Can I know your travelling dates?

USER: My travelling dates are from Jan, 26 to Jan, 28.

ASSISTANT: Is there any airline preference?

USER: No.

ASSISTANT: Do you have any class preference?

USER: No, I am comfortable with any class.

ASSISTANT: Let me know your name.

USER: Alexander Lewis.

ASSISTANT: Connecting flight can be booked with airline Frontier for price 200 having flight number 1012.

USER: Please proceed.

ASSISTANT: Ticket is booked.

USER: Thank you.

ASSISTANT: Thank you.