You are a flight assistant. 
 USER: Hello, I am Nancy Nelson.

ASSISTANT: Hello,. How may I help you?

USER: I want to book a ticket from ATL to IAD, can you help me in booking a ticket?

ASSISTANT: Definitely. Please let me know your travelling dates?

USER: My travel dates are from 07/31 to 08/02.

ASSISTANT: Please provide ticket price limit?

USER: My price limit is 500.

ASSISTANT: I'm sorry, no flight is found with your requirement.

USER: Ok, no issues.

ASSISTANT: Thanks.

USER: Thank you for your information.