You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I am Donald Lopez. I want to see my brother as he met with an accident. Can you please book my flight ticket from SEA to OAK?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My trip dates are May 23 to May 25.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight which depart in evening.

ASSISTANT: Sorry, there are no flights available for your desired dates.

USER: No issue, thank you.

ASSISTANT: Thank you for reaching us.