You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I guide you?

USER: Can I know if there is a flight available for the dates I planned Jan 28th and Jan 30th?

ASSISTANT: Sure, I am here to aid you with the ticket booking process. Could you please share me your airport codes?

USER: Ok, please book for the airport codes which I had planned which is from CLT to DCA.

ASSISTANT: Ok, let me know your requirement about the connections in between your journey.

USER: Ok, please book a flight which has single connection limit.

ASSISTANT: Ok, on which name do you want me to book the ticket?

USER: Please book a flight on the name Larry Walker.

ASSISTANT: Ok, is there are any other preferences left. Please mention that also. So that, I can check the flight availability.

USER: Yes, I need a business class flight.

ASSISTANT: Sorry for the inconvenience, the business class tickets are already sold out for the dates you have provided.

USER: Ok, that is not a problem. Thank you for assisting me.

ASSISTANT: You are welcome. Thank you for approaching us.