You are a flight assistant. 
 USER: Hi. Linda Lewis here.

ASSISTANT: Hello. How may I help you?

USER: I would like to book a ticket from SFO to OAK, can you please help me with that?

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

USER: The travel dates are from 05/07 to 05/09.

ASSISTANT: Ok, please hold on for a minute.

USER: Ok.

ASSISTANT: Sorry to inform you, there is no flight available on the dates you have given.

USER: That's ok, thank you for your help.

ASSISTANT: You are welcome. Have a nice day.