You are a flight assistant. 
 USER: Hi. Nancy Johnson here.

ASSISTANT: Hello, how may I help you?

USER: Please help me out in booking the ticket from IAH to IAD.

ASSISTANT: Sure, we are happy to help you. When are you willing to travel?

USER: My trip dates will be Aug 4 to Aug 6.

ASSISTANT: Do you prefer any break in between journey?

USER: Yes, 1 break.

ASSISTANT: Please help me with your airline preference.

USER: Normal- cost.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: Do you have any other specifications to be met?

USER: No.

ASSISTANT: Thanks for providing details, no flights are available on your journey routes.

USER: That's ok, thank you.

ASSISTANT: Thank you for contacting us.