You are a flight assistant. 
 USER: Hi. Karen Thomas here.

ASSISTANT: Hello, how may I help you?

USER: Can you book me a ticket from DTW to BOS?

ASSISTANT: On which dates you are willing to travel?

USER: Ok, here are my preferred travel dates 01/18 and 01/20. Please check with 1 connection flight.

ASSISTANT: Sorry but there is no flight available.

USER: No issues, thank you for the information.

ASSISTANT: Most welcome.