You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Christopher Garcia here. I have planned to go to LAX with my cousin from OAK. Please book our tickets.

ASSISTANT: Sure, can you please tell your travelling dates?

USER: My travelling dates are from 11/04 to 11/06.

ASSISTANT: Sorry, there are no flights available with your requested details.

USER: That's fine. Thank you for your time.

ASSISTANT: Thank you an have a nice day.