You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Steven Williams.

ASSISTANT: How may I assist you?

USER: I would like to visit Oakland. Can you help me for booking a flight ticket from LAX to OAK?

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

USER: My journey dates are Apr 14 to Apr 16.

ASSISTANT: How much you can afford for airfare?

USER: My fare is 5000.

ASSISTANT: Steven Williams, there are no flights available in your route.

USER: No issue, thank you.

ASSISTANT: Thank you for reaching us.