You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I be your helping hand today?

USER: Can you help me in booking my flight ticket from DCA to LAX?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: May I know your planned dates please?

USER: My trip dates will be Jan 28th to Jan 30th.

ASSISTANT: Ok, please specify your name.

USER: I am Stephanie Evans.

ASSISTANT: Is there any connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Do you have any other concerns?

USER: No.

ASSISTANT: Sorry to say that, no flights are found based on your information.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.