You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I want to book a flight ticket from DFW to DCA, can you help me with it please?

ASSISTANT: Sure, We are here to help you.

USER: Thank you.

ASSISTANT: Can I know your travelling dates?

USER: Yes, my travelling dates are 25 and 27 of July.

ASSISTANT: Do you need any break?

USER: Yes, I need a break.

ASSISTANT: May I know your name?

USER: My name is Emily Campbell.

ASSISTANT: Is there any other specifications?

USER: I want to return in the afternoon.

ASSISTANT: Please be on hold for sometime, as I can check a flight for your journey with the best airlines.

USER:  Ok.

ASSISTANT:  We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for opting us.