You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: Help me in booking a flight from IAD to SEA?

ASSISTANT: Sure, We are here to help you. Can I know your travelling dates?

USER: I like to travel on Aug 17 to 19.

ASSISTANT: Do you need any break?

USER: I prefer travelling in single connection flight.

ASSISTANT: May I know your name?

USER: I am Rachel Green.

ASSISTANT: Is there any other specifications?

USER: I want to return back in morning flight.

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

USER: Ok. thank you.

ASSISTANT: Thank you for reaching us.