You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you reserve a ticket from IAD to CLT?

ASSISTANT: Sure, I am here to help you. Please let me know your planned trip dates.

USER: I am willing to travel on July 27 and return on July 29.

ASSISTANT: Do you have any break in between journey?

USER: I need a connecting flight.

ASSISTANT: Are there any other specifications for you?

USER: I prefer to travel in business class.

ASSISTANT: Can I have your good name?

USER: I am Brenda Martinez.

ASSISTANT: Sorry, no flights are available on your journey dates.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for availing us.