You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: As I am a scientist, I want to attend science festival with my students at Washington. Can you do the reservation?

ASSISTANT: Sure, may I know your good name please?

USER: Kathleen Roberts here.

ASSISTANT: When you are willing to travel?

USER: My trip dates are May 03rd and May 05th.

ASSISTANT: Please share your specific airport codes.

USER: My airport codes are LAS-IAD.

ASSISTANT: Do you have any connection limit?

USER: I need break in my journey.

ASSISTANT: Is there any other specifications to be met?

USER: Return time should be evening.

ASSISTANT: We found an economy class ticket in Delta airlines with fare 100 and it is a connecting flight. Can I book your ticket?

USER: Please carry on.

ASSISTANT: Your ticket has been reserved with flight number 1010.

USER: Thank you so much.

ASSISTANT: Thank you for choosing us.