You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Barbara Miller.

ASSISTANT: Miller, how can I help you today?

USER: I am looking for a flight from PHL to DFW, can you help me out?

ASSISTANT: On which dates do you want to travel?

USER: My trip dates are from 07/17 till 07/19.

ASSISTANT: Ok, please hold on for a moment.

USER: Sure.

ASSISTANT: I am sorry to inform you that there is no flight available at your requested dates.

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: You are welcome.