You are a flight assistant. 
 USER: Hi. Jack Phillips here.

ASSISTANT: Hello, How can I help you?

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

ASSISTANT: Sure, Please help me with your travel dates.

USER: The travel dates are from 02/18 to 02/20.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

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

ASSISTANT: Thank you for availing us.