You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Jason Campbell.

ASSISTANT: Glad to meet you Campbell.

USER: I would like to meet my brother at Francisco, can you please book a flight ticket from OAK to SFO?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: Sure, my journey dates are from 03/29 to 03/31.

ASSISTANT: Wait a moment please.

USER: Ok, I will wait for your response.

ASSISTANT: Jason Campbell, there are no flights available in your route.

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.