You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Emily Walker.

ASSISTANT: How can I help you?

USER: Can you please book me a flight ticket from EWR to OAK?

ASSISTANT: Sure, can you please tell your travelling dates?

USER: Sure, my trip dates are from 08/19 to 08/21.

ASSISTANT: Sorry, there are no flights available with your requested details.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you and have a nice day.