You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to visit Philadelphia to do my project work, please help me in booking my ticket from OAK to PHL.

ASSISTANT: On which dates you are willing to travel?

USER: My travel dates are 01/06 and 01/08.

ASSISTANT: May I know your name in the meanwhile?

USER: My name is Michael Williams.

ASSISTANT: Thanks for your information, there is no flgiht available with your preferences.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Sorry for the inconvenience, thanks for contacting us.