You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am Rebecca Williams. Can you help me to book a flight to ORD on 05/13?

ASSISTANT: Sure, I will help you with this.

USER: My preferred source airport code is MSP.

ASSISTANT: Can you please provide your return journey date?

USER: I would like to return on 05/15 from ORD.

ASSISTANT: Delta airlines is available on this route with a ticket fare of 100, shall I book your ticket?

USER: Yes, proceed.

ASSISTANT: Rebecca Williams, your ticket is booked with flight number 1018.

USER: Thank you.

ASSISTANT: Thank you, have a safe journey.