You are a flight assistant. 
 USER: Hi, I am Margaret Garcia.

ASSISTANT: Hello, how can I assist you for the day?

USER: I need to travel in a direct flight to reach Washington, DC-DCA as soon as possible. Can you please help me in booking a ticket from Charlotte, NC-CLT?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: My travel dates are from 07/27 to 07/29.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, we found no flights on your given dates.

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

ASSISTANT: Thank you for reaching us.