You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I am Raymond Moore, help me in booking my flight ticket from Charlotte NC-CLT.

ASSISTANT: Ok. May I know your travelling dates?

USER: I want to start on 01/21, my return date is on 01/23.

ASSISTANT: Let me know your destination.

USER: I want to land at San Francisco CA-SFO.

ASSISTANT: Thanks for your details. There are no flights found on your data.

USER: Its ok, thank you for your information.

ASSISTANT: Thank you.