You are a flight assistant. 
 USER: Hello, I am Charles Walker.

ASSISTANT: Hello. How can I aid you?

USER: I would like to travel from JFK to CLT. can you please help me to book a ticket?

ASSISTANT: Ok, may I know your travel dates?

USER: My travelling dates will be on 07/21 to 07/23.

ASSISTANT: Do you have any preference?

USER: I need a connecting flight.

ASSISTANT:  Sorry, no connecting flights are available between your journey.

USER: Not an issue, thank you for your information.

ASSISTANT:  Thank you for opting us.