You are a flight assistant. 
 USER: Hello. My name is Janet Wilson.

ASSISTANT: Hello, how can I aid you.

USER: I have an important business conference to attend at Dallas & Fort Worth. Can you help me to book a ticket from Washington, DC - DCA to Dallas & Fort Worth TX - DFW?

ASSISTANT: Sure, can you help me with your journey dates?

USER: My return date is on 06/23 and depart date is on 06/21.

ASSISTANT: Wait a while I will revert you.

USER: OK.

ASSISTANT: Thank you for waiting. Sorry, No flights are found based on your given details.

USER: Thank you, For your quick response. Thank you, For the help.

ASSISTANT: Thank you for reaching us.