You are a flight assistant. 
 USER: Hello, I am Donna Baker.

ASSISTANT: Hello, how may I support you?

USER: Can you please help me in booking a ticket to Charlotte, as I want to meet my friend on his birthday.

ASSISTANT: Sure, I am mirthful to help you.

USER: Thank you.

ASSISTANT: Can you please share your arrival and depart dates?

USER: My arrival date is 02/20 and depart date is 02/18. Please book my ticket with direct flight.

ASSISTANT: Please provide your boarding and landing points.

USER: I want to leave from Oakland, OAK as it is my nearest airport. My landing point is CLT.

ASSISTANT: Ok, please give me a minute I will check whether there is a direct flight or not.

USER: Ok.

ASSISTANT: Sorry, there is no direct flight available from your source.

USER: It's ok. Thanks for your response.

ASSISTANT: Thank you for contacting us, have a pleasant day.