You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sandra Young.

ASSISTANT: How can I assist you today?

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

ASSISTANT: Sure, can you please share your travel dates?

USER: I would like to take off on 12/07 and return on 12/09.

ASSISTANT: Let me check for the availability of flight.

USER: Sure.

ASSISTANT: Sandra, there is no flight available at your requested dates.

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

ASSISTANT: Thank you for reaching us.