You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: May I know if you can book a flight ticket from CLT to SFO as I need to reach San Francisco. Can you help?

ASSISTANT: Sure, can you please share your travel dates?

USER: Ok, I will be starting on 02/21 and return date is 02/23.

ASSISTANT: May I know your name to proceed further?

USER: Ok, please book on the name Gary Taylor.

ASSISTANT: Let me check for the availability of flight.

USER: Ok, I will wait.

ASSISTANT: Gary, I am sorry to inform you that there is no flight available at your requested dates.

USER: That is ok, thank you for assisting me.

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