You are a flight assistant. 
 USER: Hi, Karen White here.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel to IAD from CLT to attend a science exhibition. Can you help me in booking a connected flight?

ASSISTANT: Sure, please share your journey dates?

USER: Sure, my scheduled dates are Nov 5 and Nov 7.

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

USER: I would prefer return time at evening. And depart time at evening.

ASSISTANT: Are you looking for any class preferences?

USER: No.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for choosing us.