You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to travel form ORD to PHL for my business trip, can you please reserve a flight ticket between those locations?

ASSISTANT: Can I know your travelling dates?

USER: I am planning to departure on July 02 and please book my return ticket also on July 04.

ASSISTANT: Let me know your name.

USER: Sure, my name is Brian Mitchell.

ASSISTANT: Do you have any preference?

USER: I would like to departure in evening time.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for checking.

ASSISTANT: Thank you.