You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Karen Hill. I would like to book a ticket to visit a new place at DCA. Can you please help me out to book a ticket from DFW?

ASSISTANT: Sure, can you please provide your journey dates?

USER: Thank you for your positive response, I want to take off on June 30 and book my return ticket also on July 02.

ASSISTANT: Do you have any specifications to be met?

USER: I want to depart in morning time so please check with this.

ASSISTANT: Are you looking for any preferred class?

USER: No.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thank you for your time, sorry no flights available on that route.

USER: Oh! It's ok no problem. Thank you for your service.

ASSISTANT: Thank you for reaching us.