You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Nancy Perez.

ASSISTANT: Nice to meet you Nancy.

USER: Me and my friends are planning to go Angel Island for hiking, can you please book me a ticket from SFO to OAK? My journey dates are 11/17 and 11/19.

ASSISTANT: Sure, may I know the journey dates please? Ok, please hold on for a moment.

USER: Sure.

ASSISTANT: Sorry to say this Nancy, we could not find a flight matching your requirements.

USER: Oh! that's ok. Thank you for the information.

ASSISTANT: Thank you.