You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Deborah Turner here.

ASSISTANT: How may I help you?

USER: I will travel from ORD to SFO to visit a hill station in San Francisco. So book a flight ticket for me.

ASSISTANT: Please help me with your journey dates.

USER: My travelling dates are from 05/15 to 05/17.

ASSISTANT: Please hold on a moment.

USER: Ok.

ASSISTANT: Thank you for your waiting, I found a flight for you in UA airlines with price 200. Can I proceed?

USER: Sure, you can book this flight.

ASSISTANT: Ok, your ticket has been booked with flight number 1019.

USER: Ok, thanks for booking my flight.

ASSISTANT: Thank you for choosing us.