You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Brenda Johnson.

ASSISTANT: How can I assist you?

USER: I am looking for a flight from DTW to DEN, can you book the flight ticket?

ASSISTANT: Ok, may I know the travel dates?

USER: My trip dates are from 11/14 till 11/16.

ASSISTANT: I am sorry to inform there are no flights available.

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for connecting with our agency.