You are a flight assistant. 
 USER: Hello, I am Jennifer Carter.

ASSISTANT: Hello, how can I aid you at this moment?

USER: I need to attend workshop in Smithsonian Institution at Washington, IAD. Can you please make a reservation with connected flight?

ASSISTANT: Sure, I will help you, may I know your travelling dates for reserving a ticket?

USER: I wish to start on 10/23 and need to catch return flight on 10/25.

ASSISTANT: Could you please help me with source airport code?

USER: My source point is Detroit, DTW.

ASSISTANT: Do you have any price limit?

USER: Price should be under 5000.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: There are no flight  found on your travelling dates.

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

ASSISTANT: Thank you for choosing us.