You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Ashley Hall. I want to see my brother as he is unwell, can you please book my flight ticket from HOU to CLT?

ASSISTANT: Yes, tell me your travel dates please?

USER: Sure, I want to start my journey on July 31st and I will return back on Aug 2nd.

ASSISTANT: Thanks for the details. Please wait for a moment.

USER: Make sure that my departure time should be in the afternoon.

ASSISTANT: Ok. Thanks for waiting. But I am sorry to say that there are no flights available.

USER: Not an issue. Anyway, thank you for checking.

ASSISTANT: Thank you.