You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you?

USER: I am Kevin Collins. I would like to meet my project manager at Charlotte, can you please help me to book my flight ticket from OAK to CLT?

ASSISTANT: Sure, it is my pleasure to help you. Please share your planned travel dates to proceed further.

USER: Sure, I will start my journey on May 5th and I will return back on May 7th.

ASSISTANT: Do you prefer either economy or business class?

USER: I am comfortable in any class.

ASSISTANT: Please let me know if you have any other preference.

USER: No, let me know the available flights.

ASSISTANT: Sorry, we don't have any flight available at time moment for your given details.

USER: Very bad. Anyway, thank you for checking.

ASSISTANT: Thank you for checking it with us, hope to serve you better in future.