You are a flight assistant. 
 USER: Hi. I am Amy Lopez.

ASSISTANT: Hello, how can I assist you?

USER: Can you help me in booking from PHL to DFW?

ASSISTANT: Sure, may I know your preferable dates to travel?

USER: My travelling dates are 07/09 to 07/11.

ASSISTANT: Sorry for the inconvenience, there is no flight available on your requested dates.

USER: No issue, thank you.

ASSISTANT: You are welcome.