You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, may I know your planned trip dates?

USER: My trip dates are Jan 27 and Jan 29.

ASSISTANT: Do you have any connection limit?

USER: I need single connection flight.

ASSISTANT: Is there any class preference?

USER: No, other preference.

ASSISTANT: Please share your name.

USER: Myself John Hernandez.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry, there are no flights found on your specified trip dates.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for availing us.