You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Can you book a flight ticket from DCA to PHX?

ASSISTANT: Yes, can you tell me your travelling dates?

USER: My travelling dates are from Jan 12 to Jan 14.

ASSISTANT: Do you have any other specifications?

USER: I need to travel in business class.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested criteria.

USER: Ok, No issues. Thank you.

ASSISTANT: Can I know your name for documentation?

USER: My name is Dennis Baker.

ASSISTANT: Thank you for contacting us.

USER: Thank you.