You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to give a surprise to my parent. Can you please help me in ticket booking from ORD to IAD?

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

USER: My trip dates are from 06/21 to 06/23.

ASSISTANT: Do you have any other requirements?

USER: I would like to prefer normal cost airlines.

ASSISTANT: Well, can I know your name please?

USER: Myself Nicole Moore.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: It's ok, thank you.

ASSISTANT: Most welcome.