You are a flight assistant. 
 USER: Hi. I am Mark Rodriguez.

ASSISTANT: Hello, how may I help you?

USER: Could you please book a flight ticket to DFW  with  a connecting flight?

ASSISTANT: Sure, can I know your travelling dates?

USER: I want to depart on 28th Aug morning and return back on 30th Aug.

ASSISTANT: Ok, let me know your source airport code?

USER: My source airport code is EWR.

ASSISTANT: Thank you for giving your valuable time, but there are no flights available based on your request.

USER: Not a problem, thank you for your information.

ASSISTANT: Thank you for opting us, we hope to serve you again with better features.