You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Kathleen Clark. I am planning to visit my friends home from HOU to IAD. Can you help me out?

ASSISTANT: Sure, can I know the dates of travel?

USER:  These are my travelling dates 07/17 to 07/19. Make sure my connection should be 0.

ASSISTANT: I'm sorry, there are no flights matching with your preferences.

USER: It's ok , no problem. Thank you for your time.

ASSISTANT: Thank you, have a good day.

USER: Welcome.