You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Katherine Green.

ASSISTANT: How may I help you?

USER: Could you please help me with finding a flight ticket on the route DFW to PHL?

ASSISTANT: May I know your travel dates?

USER: I would like to take off on 04/17 and return on 04/19.

ASSISTANT: Sorry, there is no flight found with your requirements.

USER: That's ok, no issues. Anyways, thank you for the information.

ASSISTANT: Most welcome.