You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Carolyn Martinez. I planned to travel from CLT to DFW, can you please help me to book a flight ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: I prefer to travel on Mar 25 and Mar 27.

ASSISTANT: At what time do you like to travel?

USER: I planned to depart in afternoon.

ASSISTANT: Do you prefer economy or business class?

USER: I am comfortable with all the classes.

ASSISTANT: Sorry, there is no flight on your details.

USER: Ok, no problem. Thank you for your time.

ASSISTANT: Thank you.