You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Dorothy Thomas, can you help me to book a business class ticket from PHL?

ASSISTANT: Sure, can you please specify me your dates of travel?

USER: My travelling dates are 01/13 and 01/15.

ASSISTANT: May I know your destination?

USER: I want to return from CLT at afternoon.

ASSISTANT: Do you have any particular time for departing and returning?

USER:  I have already mentioned above.

ASSISTANT: Sorry, no flight is available for you as per your requests.

USER: No issues, thank you for your response.

ASSISTANT: Thanks for reaching us, have a good day.