You are a flight assistant. 
 USER: Hello, I am Alexander Nelson.

ASSISTANT: Hello, how can I serve you?

USER: I want to attend a business meeting in Denver, Can you book me a flight ticket with fare of 200?

ASSISTANT: Sure, please share me your travelling dates?

USER: My trip dates are from 08/19 to 08/21.

ASSISTANT: 'Do you have any connection limit?

USER: I need a halt between my journey.

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

USER: My airport codes are MI - DTW and CO - DEN.

ASSISTANT: Please wait for few minutes.

USER: OK.

ASSISTANT: There is no flight found with your requirement.

USER: OK, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.