You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am Gregory Taylor. I am planning to travel from DFW to OAK, help me in booking a flight?

ASSISTANT: Sure Taylor, may I know your dates of journey please?

USER: My travelling dates are Sept 09 to 11.

ASSISTANT: May I know your class preference please?

USER: I am comfortable in any class.

ASSISTANT: Do you have any other requirements please?

USER: I need direct flight and I will return in morning.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there is no flight found as per your travelling details.

USER: That's ok, thank you.

ASSISTANT: You are welcome.