You are a flight assistant. 
 USER: Hi, I am Linda Allen.

ASSISTANT: Hello. How can I aid you?

USER: I am planning to book a flight from Chicago to reach PHL, so please help me in booking a flight.

ASSISTANT: Sure, may I know your planned travel dates to check for the flight availability?

USER: Sure, my planned dates are on Sept 11th to 13th.

ASSISTANT: Do you have any specifications?

USER: My depart time is morning.

ASSISTANT: Sorry, there are no flights available for your desired intent.

USER: No worries, thank you.

ASSISTANT: Thank you for reaching us.