You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Carol Williams here.

ASSISTANT: How may I help you at this moment?

USER: I need to book a flight ticket from DFW to BOS. Can you please help me with booking?

ASSISTANT: Sure, I am here to help you with that. Can I know your planned trip dates?

USER: My planned trip dates are 08/01 and 08/03.

ASSISTANT: Please give me a minute.

USER: Sure, take your own time.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: Not a big problem, anyway, thank you for the information.

ASSISTANT: Thank you for approaching us.

USER: Thank you for searching.

ASSISTANT: You are welcome.