You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am planning to visit Library of Congress to collect some information at DCA, can you help me with booking?

ASSISTANT: Sure, I am here to help you. May I know your source airport code?

USER: Thank you.

ASSISTANT: Can you please share your travelling dates?

USER: My source airport code is PHX. My travelling dates are Nov 30 and Dec 02.

ASSISTANT: Do you have any connection limit?

USER: I need a break in between my journey.

ASSISTANT: Do you have class preference?

USER: No.

ASSISTANT: May I know your name?

USER: I am Carol Adams.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.