You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Angela Mitchell.

ASSISTANT: How may I help you?

USER:  I am planning for a world trip, so I want to start my trip from ATL to OAK.

ASSISTANT: Ok, that's great. May I know your trip dates?

USER: My travelling dates are from 07/21 to 07/23.

ASSISTANT: Sorry Angela, no flight had been found on your details.

USER: Ok, no problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your services.