You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to travel from IAD to OAK as a business trip. Can you do the reservation?

ASSISTANT: Sure, may I know your depart and arrival dates?

USER: My journey dates are 10/06 and 10/08.

ASSISTANT: Do you have any connection limit?

USER: I need break in my journey.

ASSISTANT: Is there any class preference?

USER: I am comfortable with economy class.

ASSISTANT: Any other specifications to be met?

USER: My departure time should be evening.

ASSISTANT: May I know your name?

USER: Samuel White here.

ASSISTANT: Sorry, there were no flights found on your route.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you.