You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am Richard Miller. Can you book ticket from OAK to ORD?

ASSISTANT: Can I know your travelling dates?

USER: My travelling dates are 08/25 to 08/27. Make sure the connection is 1.

ASSISTANT: Ok, let me check for the availability of flight.

USER: Sure.

ASSISTANT: I appreciate your patience. Richard, I am sorry to inform you that there is no flight available at your requested dates.

USER: No issue. Thank you for checking.

ASSISTANT: You are welcome. Thank you for contacting us.