You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am James Parer. I want to attend the robotics workshop in LAX. Can you book me a ticket from PHL?

ASSISTANT: Sure, please share your travel dates also.

USER: I would start on June 16th and return on June 18th.

ASSISTANT: May I know your departure time and return time?

USER: I need to depart in the afternoon.

ASSISTANT: Do you have any specification?

USER: I would like to travel in normal cost airline.

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

USER: That's alright, thanks for your assistance.

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