You are a flight assistant. 
 USER: Hello. I am Deborah Collins.

ASSISTANT: Hello, how can I serve you today?

USER: I want to book a ticket from LGA to OAK for a vacation, Can you please book a ticket for me?

ASSISTANT: Sure, may I know your travelling days?

USER: Travelling dates are from 02/04 to 02/06 with price 5000.

ASSISTANT: Please wait for a minute, I will check the availability of flights and revert you.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry to inform you that there is no flights available in the specified days.

USER: Thank you.

ASSISTANT: Thank you for availing with us.