You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Joshua Wright.

ASSISTANT: Yes, tell me.

USER: I want to go Chicago to attend baby shower party of my sister, please book me a ticket from OAK to ORD.

ASSISTANT: May I know your trip dates?

USER: Yes, my journey dates are 07/20 and 07/22.

ASSISTANT: Sorry, there is no flight.

USER: Oh! that's ok, I will try to go by road way then. Thank you for your service.

ASSISTANT:  Most welcome.