You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I help you?

USER: I am Raymond Allen.

ASSISTANT: Ok.

USER: I looking for a flight from DCA to DFW, can you help me out please?

ASSISTANT: Can you please share your travel dates?

USER: My trip dates are from 11/25 till 11/27.

ASSISTANT: As per your details, there are no flights available for you.

USER: That's ok, no problem. Thank you for your response.

ASSISTANT: Thank you for choosing us.