You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Elizabeth Smith. I am planning to travel from NY-EWR to CA-OAK.

ASSISTANT: Could you please provide your travelling dates?

USER: These are my travelling dates are 02/13 to 02/15.

ASSISTANT: Sorry, there is no flight available at your request.

USER: That's fine.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your help.

ASSISTANT: Have a great day.