You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: Can you please help me to book a ticket from IAH to DCA?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: I want to depart on Feb 21 and arrival on Feb 23.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: May I know your name please?

USER: Ronald Edwards here.

ASSISTANT: Is there any specifications?

USER: I would prefer a business class.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you.