You are a flight assistant. 
 USER: Hello, my name is Alexander Roberts.

ASSISTANT: Hello, how can I help you?

USER: I am planning to book a flight ticket to EWR from PHL, can you please do it for me?

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

USER: Sure, my trip dates are 11/07 and 11/09.

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

USER: It's ok, thank you for the information.

ASSISTANT: You are welcome.