You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Can you avail me to book a flight from PHL to JFK?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: My travel dates are Apr 17 and 19.

ASSISTANT: Ok, please share your name.

USER: Charles Wright.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us, have a nice day.