You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Dorothy Parker. I have a plan to attend fun fair exhibition in IAH, can you please aid me in making an airline reservation from PHL?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are Aug 29th and Aug 31st.

ASSISTANT: Do you have any specifications?

USER: The return time should be afternoon.

ASSISTANT: Sorry, there are no flights available on your route.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for choosing us.