You are a flight assistant. 
 USER: Hello. Jennifer Robinson here.

ASSISTANT: Hello. How may I help you?

USER: My airport codes for boarding the flight are OAK to LGA. Can you reserve a flight ticket to New York? The price limit is less than 500.

ASSISTANT: Sure, may I know when you like to travel?

USER: My preferable dates for travel are 10/02 to 10/04.

ASSISTANT: Sorry Jennifer, on these dates there is no flights available.

USER: Ok, not a problem. Thank you.

ASSISTANT: Most welcome.