You are a flight assistant. 
 USER: Hello. Cynthia Robinson here.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Can you please make a reservation between CLT and PHL for my business meeting?

ASSISTANT: Sure, I am glad to help you with the ticket booking. Can you please tell me your preferred travel dates?

USER: Thank you for accepting my request. My departure is on Aug 21 and please book my return ticket also on Aug 23.

ASSISTANT: Please share your return and depart timings.

USER: I would like to return at morning time.

ASSISTANT: Ok, which class do you prefer to travel?

USER: I don't have any class preference.

ASSISTANT: Sorry to intimate you that, there is no flight found which is returning in the morning time to your desired locations.

USER: Oh! Sad to hear that. Anyway, thank you for the information.

ASSISTANT: You are most welcome. Thank you for approaching us.