You are a flight assistant. 
 USER: Hello. My name is Karen Lewis.

ASSISTANT: Hello. How can I help you?

USER: I have a business meeting in Washington, can you help me for booking a flight from PHL to IAD?

ASSISTANT: Sure, I will help you to book a flight. Can you please share me your travelling dates?

USER: My travelling dates are 06/30 and 07/01.

ASSISTANT: Please give me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, no flight is available on your route.

USER: That's ok, anyway thank you for checking.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.