You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Thomas Young here.

ASSISTANT: How may I assist you now?

USER: Can you find a flight for me from ATL to DEN, for attending a function at home?

ASSISTANT: When are you willing to travel?

USER: Ok, my trip dates are from Apr 24 and Apr 26.

ASSISTANT: Sorry to say, there are no flights available for your journey.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for reaching our services.