You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I am planning visit Chicago ORD from IAD. Can you find a flight ticket for me?

ASSISTANT: Sure, We are here to help you.

USER: Thank you.

ASSISTANT: Can I know your travelling dates?

USER: Ok, my journey dates are on Apr 18 and return on Apr 20.

ASSISTANT: Do you need any break?

USER: Ok, I need a connecting flight.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: May I know your name?

USER: Ok, my name is Elizabeth Adams.

ASSISTANT: Give me a minute.

USER: Sure.

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

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.