You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you help me in booking a flight ticket from DFW to EWR?

ASSISTANT: Can you give me your travel dates?

USER: I want to travel on 03/23, and return on 03/25.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a single connection.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Ok, your name please.

USER: I am Mark Hernandez. Make sure, I need to return in the evening time.

ASSISTANT: Ok. Sorry to say that, there is no flight found with your details.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for reaching us.