You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Stephanie Martinez. Please book a flight ticket from DTW to DEN.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can I have your depart and arrival dates?

USER: My travel dates are Apr, 8 and Apr, 10.

ASSISTANT: Let me know your airline preference.

USER: I am comfortable with anyone.

ASSISTANT: Please, wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, there were no flights available that matches your requirements.

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

ASSISTANT: Thank you for choosing us.