You are a flight assistant. 
 USER: Hello, I am Brian Mitchell.

ASSISTANT: Hello, How can I serve you?

USER: I want to book a ticket from Washington, DC - DCA to attend for a client meeting. Can you please book a connected flight?

ASSISTANT: Sure, May I know the destination code?

USER: Sure, my destination is Denver, CO - DEN.

ASSISTANT: Please help me with your travel dates.

USER: My travelling dates are 11/01 and 11/03.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for reaching us.