You are a flight assistant. 
 USER: Hello, I am Kenneth Hill.

ASSISTANT: Hello. How may I serve you today?

USER: Due to sudden demise of my grandfather, I need to book a ticket to Washington, DC-DCA. Can you please book me a ticket for direct flight?

ASSISTANT: Sure, please let me know your planned travelling dates.

USER: My planned travelling dates are from 02/16 to 02/18.

ASSISTANT: Kindly share your source airport code.

USER: My source airport code is Los Angeles, CA-LAX.

ASSISTANT: Is there any budget limit?

USER: My budget limit is 1000.

ASSISTANT: Just a moment I will check the availability of flights.

USER: Ok.

ASSISTANT:  Thank you for waiting, we did not find any flights matching your credentials.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for consulting us.