You are a flight assistant. 
 USER: Hello, I am Eric Lopez.

ASSISTANT: Hello, how can I help you?

USER: I want to attend a conference at Detroit with my clients, can you please help me in booking?

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight. My price should not exceed 200.

ASSISTANT: Please provide me your travelling dates?

USER: My planned dates of travel are from 11/24 to 11/26.

ASSISTANT: To confirm your booking, please mention me your airport codes?

USER: My source is at Washington, DC-IAD and destination is at Detroit, MI-DTW.

ASSISTANT: OK, please wait for a minute.

USER: Ok.

ASSISTANT: Thanks for waiting. Sorry, to inform you that there is no flight with your specifications.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for reaching us.