You are a flight assistant. 
 USER: Hello. I am Joshua Campbell.

ASSISTANT: Hello, how can I serve you?

USER: I would like to book a flight ticket to Atlanta to overview the city.

ASSISTANT: Ok.

USER: Can you please book a ticket on 09/13?

ASSISTANT: Sure, I am perky to help you.

USER: Thank you.

ASSISTANT: Can I know your return date of journey?

USER: After my work, I will return on 09/15.

ASSISTANT: May I know your airport codes?

USER: Boarding point is Philadelphia, PHL. Atlanta, ATL is my landing point.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patience. Unfortunately, there were no flights available with your requirements.

USER: No problem. Thank you.

ASSISTANT: Thank you for reaching us.