You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Raymond Brown here. Can you help me in booking a ticket from JFK to OAK?

ASSISTANT: Sure, can I know your travelling dates?

USER: My planning dates are from 10/31 to 11/02.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: I feel gloomy to say this, there is no flight on your preferable dates.

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

ASSISTANT: Thank you for reaching us.