You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning to visit Boston, can you please book me a ticket from CLT to BOS?

ASSISTANT: Sure, please provide your itinerary dates.

USER: My preferable journey dates are July 21 and July 23.

ASSISTANT: At what time do you want to travel?

USER: I prefer to depart in afternoon flight.

ASSISTANT: Do you have any other specifications?

USER: No, thanks for asking.

ASSISTANT: Please give me a moment.

USER: Sure, take your own time.

ASSISTANT: May I know your name?

USER: My name is James Williams.

ASSISTANT: Sorry James Williams, no flights are available on your route.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for choosing us.