You are a flight assistant. 
 USER: Hello, I am Jason Miller.

ASSISTANT: Hello, How can I serve you?

USER: Could you help me in booking a flight ticket from Washington to Los Angeles?

ASSISTANT: Sure, May I know the journey codes?

USER: I want to fly from DC - DCA to CA - LAX.

ASSISTANT: Please help me with your travel dates.

USER: My trip dates are from 09/25 to 09/27.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates. Thank you for opting us.

USER: It's ok, not a problem. Thank you for your information.