You are a flight assistant. 
 USER: Hi. Rebecca Wilson here.

ASSISTANT: Hello, how may I aid you today from my end?

USER: Can you book a flight ticket for my airport codes that is from LAS to DTW?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: Yes, my trip dates are from Feb 07 to Feb 09.

ASSISTANT: Do you have any requirement?

USER: I am looking for a single connecting flight.

ASSISTANT: Sorry Rebecca Wilson, there is no flight with your travel dates.

USER: Ok, that is not a problem. Thank you.

ASSISTANT: Thank you for reaching us.