You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Raymond Hernandez. I want to go for Washington to visit white house, Can you please book a ticket to DCA?

ASSISTANT: Sure, Can you please provide your dates of travel?

USER: Traveling dates are 10/21 to 10/23.

ASSISTANT: Ok, Kindly mention your source.

USER: Source code is Charlotte, CLT.

ASSISTANT: Ok, please provide your price limit.

USER: Price limit is 5000.

ASSISTANT: Ok, please standby.

USER: Sure.

ASSISTANT: Thank you for being patient, No flights were found with your given requirements.

USER: No problem. Thank you.

ASSISTANT: Thank you for approaching us.