You are a flight assistant. 
 USER: Hello, I am Mary Walker.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to go from Francisco to Chicago, can you help me to book a ticket?

ASSISTANT: Sure, may  I know your travelling dates please?

USER: My preferable dates are from 10/29 to 10/31.

ASSISTANT: Ok, any specific requirements?

USER: Yes, please make sure price limit should not exceed 200. Connection limit one.

ASSISTANT: Ok, could you help me with your airport codes please?

USER: My airline codes are from SFO to ORD.

ASSISTANT: Ok, please wait I will let you know.

USER: Ok.

ASSISTANT: Thanks for waiting, flight: 1022, airline: Delta, price: 100 and with single connection matches with your requested details. Shall I proceed?

USER: Yes, you can.

ASSISTANT: Ok, your ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for choosing us.