You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Myself Karen Taylor, will you help me in booking the flight ticket from CLT to OAK?

ASSISTANT: Sure, let me know your travel dates please?

USER: My travelling dates are May 24 and May 26.

ASSISTANT: Do you have any specific depart and arrival timings?

USER: My depart time must be in evening.

ASSISTANT: Ok, is there any class preference?

USER: No, thank you for asking.

ASSISTANT: May I know your connection limit?

USER: I need a flight with single connection.

ASSISTANT: Do you have any airline preference?

USER: No, I am comfortable in any airlines.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: Ok, not an issue. Thank you for your information.

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