You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am planning to attend seminar in DEN, will you please aid me in booking a flight ticket from PHL?

ASSISTANT: Sure, can you share your travel dates please?

USER: My travel dates are Oct 13th and Oct 15th.

ASSISTANT: May I know your good name?

USER: Paul Wilson.

ASSISTANT: Please share your connection limit.

USER: I need a flight with single connection.

ASSISTANT: Is there any other preferences for you?

USER: The return time should be evening.

ASSISTANT: Sorry, there is no flight service available on your required route.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.