You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christopher Smith.

ASSISTANT: Can you please tell me how may I assist you?

USER: Can you please help me to search a flight from Washington, DC-DCA?

ASSISTANT: May I know your trip dates?

USER: The trip dates are 12/12 to 12/14.

ASSISTANT: Can you please provide me your destination airport code?

USER: Sure, the destination airport code is DC-IAD.

ASSISTANT: Ok, please wait.

USER: Sure, take your time.

ASSISTANT: Sorry, no flights found with your details to reserve your ticket.

USER: No problem, I will search another way to complete my trip.

ASSISTANT: Ok, fine thank you for reaching us.