You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I best serve you today?

USER: Could you please book me a ticket from ORD to MSP?

ASSISTANT: Sure, please share me your trip dates.

USER: I am planning to start on Apr 18th and return on Apr 20th.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I would prefer a connecting flight.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: I am William Anderson.

ASSISTANT: Is there any time concern for you?

USER: No.

ASSISTANT: We found a UA airline and 1002 is flight number with a fare of 100. Shall I proceed?

USER: Fine, please proceed.

ASSISTANT: Your ticket is confirmed with an economy class.

USER: Thanks for your support.

ASSISTANT: Thank you for reaching us.