You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to book a flight ticket from PHL to AUS for attending a event. Can you please help me with booking a flight ticket?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travelling dates are July 3 and July 5.

ASSISTANT: Do you have any limits on number of connections?

USER: I want to travel in a direct flight.

ASSISTANT: Any another specifications?

USER: I want to depart in the evening.

ASSISTANT: May I know your name for the booking process?

USER: I am Michelle Clark.

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

USER: No worries, thank you for the information.

ASSISTANT: Welcome, thank you for reaching us.