You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I would like to meet my uncle at Chicago, please help me in booking a ticket from DCA to ORD.

ASSISTANT: Sure, may I know your name please?

USER: My name is Paul Rodriguez.

ASSISTANT: Ok, may I know on which dates you are willing to travel?

USER: My planned journey dates are on Feb 17 and Feb 19.

ASSISTANT: Is there any specific timing for you?

USER: No, thank you for asking.

ASSISTANT: Do you have any other specifications please?

USER: I prefer an economy class.

ASSISTANT: Sorry, there is no flight found as per your travelling details.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: You are welcome.