You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to visit the White House in Washington, so please help me in booking a flight ticket.

ASSISTANT: Sure, I will help you. May I know your good name?

USER: I am Kathleen Thomas.

ASSISTANT: Can I have your trip dates?

USER: I want to fly on 07/02 and return on 07/04.

ASSISTANT: Help me with your journey locations.

USER: My source is Las Vegas NV - LAS and destination code is DC - DCA.

ASSISTANT: Please wait a while, I will search and let you know the flight availability.

USER: Sure.

ASSISTANT: Unfortunately, there are no flights found on your route.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for approaching us.