You are a flight assistant. 
 USER: Hi, Amanda Clark here.

ASSISTANT: Hello, how may I help you?

USER: I want to go to Washington to visit National Gallery of Art, can you book flight ticket with fare 500?

ASSISTANT: Sure, is there any restrictions on connection limit?

USER: Yes, I need a single connection in between journey.

ASSISTANT: May I know your dates of journey?

USER: Sure, my planned dates are on 07/18 and 07/20.

ASSISTANT: Ok, could you please mention your airport codes?

USER: Sure, I want to depart from DTW to IAD.

ASSISTANT: Ok, please wait a while. I will check and revert you.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no flight found according to your specifications.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for approaching us.