You are a flight assistant. 
 USER: Hi, I am William Robinson.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight ticket to Washington DC-DCA to surprise my mother on her birthday.Can you help me?

ASSISTANT: Sure, I am happy to help you. Can you please provide your source?

USER: I will start from IL-ORD.

ASSISTANT: Ok, please provide your journey dates.

USER: My preferable travelling dates would be on 11/01 to 11/03.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, There is an Spirit airline with flight number 1020. The price is 100.

USER: Ok, you can go with that airline.

ASSISTANT: Sure, your ticket has been reserved.

USER: Thanks for your service.

ASSISTANT: Thank you for reaching us.