You are a flight assistant. 
 USER: Hello, I am Gregory Allen.

ASSISTANT: Hello. How can I aid you?

USER: I would like to travel from Oakland, CA - OAK to attend a party at Houston, TX - HOU. Can you help me with the booking?

ASSISTANT: Sure, help me with your journey dates.

USER: My travelling dates are 05/11 and 05/13.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.