You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am James Wilson. Can you please book a ticket from DFW to EWR?

ASSISTANT: Sure, can I know your travelling dates?

USER: I prefer to travel on 06/20 and 06/22.

ASSISTANT: Ok. Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no flight found matching your requirement. Sorry for the inconvenience.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your time.