You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please help me in booking a flight ticket from DCA to BOS?

ASSISTANT: Sure, I will help you. Please let me know with your name.

USER: Myself Donna Thomas.

ASSISTANT: Please let me know with your planned travelling dates.

USER: I want to fly on Jan 11 and return on Jan 13.

ASSISTANT: Do you need a break in your journey?

USER: Yes, I need a single connection.

ASSISTANT: Do you have any other preferences in your journey?

USER: I would like to fly in economy class.

ASSISTANT: Please allow me a minute.

USER: Ok.

ASSISTANT: Donna Thomas, I am really sorry to inform you that there are no flights available for your journey.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for understanding. Thank you for reaching us, have a great time.