You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, can I have your planned travel dates please?

USER: Sure, my planned dates of journey are from Apr, 02 to Apr, 04.

ASSISTANT: May I know your name please?

USER: Sure, my name is Ronald Brown.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I want to fly in a direct flight.

ASSISTANT: Can I have your class preference?

USER: I am ok with any class preference.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Ronald Brown, no flights has been found on your planned travel dates.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for reaching us.