You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: Please help me to book a flight ticket with single connection  from Charlotte to attend my sister's engagement in Washington.

ASSISTANT: Sure, I am her to help you out. Please provide me your trip dates.

USER: I need to depart on Mar 13th and my return date will be on Mar 15th.

ASSISTANT: May I know your location airport codes?

USER: My boarding and landing airport codes are CLT and DCA.

ASSISTANT: Do you have any class limit?

USER: No, I don't have any other prefernces.

ASSISTANT: May I know your name to proceed further?

USER: I am Nichole Wright.

ASSISTANT: Sorry  Nichole Wright, there is no flight in your route.

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

ASSISTANT: Thank you for reaching us.