You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: Can you help me to book my flight ticket from BOS to CLT?

ASSISTANT: Sure, May I know the travelling dates?

USER: My trip dates are Jan 15 and Jan 17 respectively.

ASSISTANT: Do you have any connection limit?

USER: I prefer for single connecting flight.

ASSISTANT: Is there any other requirements?

USER: My depart time should be in the afternoon.

ASSISTANT: May I know your name?

USER: Donna Allen here.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no problem. Thank you for assisting me.

ASSISTANT: Thank you for reaching us.