You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Kevin Phillips here, I want to reserve my ticket from OAK to JFK, can you please help me?

ASSISTANT: May I know your travelling dates?

USER: Sure, my preferable dates of journey are from 08/18 to 08/20.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry to say, no flight is available for you.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Anyways, thank you for your service.