You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I want to fly from OAK to CLT. Can you book a ticket from that route?

ASSISTANT: Sure, may I know the travelling dates?

USER: My planned travel dates are 08/19 and 08/21.

ASSISTANT: Do you have any connection limit?

USER: I want a flight with singe connection.

ASSISTANT: Is there any other requirements?

USER:  No more, thank you.

ASSISTANT: May I know your name?

USER: Sure, Alexander Nelson here.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, no flights found with your chosen dates.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for opting us.