You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Mark Harris here.

ASSISTANT: How can I assist you Mark?

USER: I want to meet my ex-wife at New York, so please book my ticket from Oakland.

ASSISTANT: Could you please tell me your travel dates?

USER: My itinerary dates are 02/01 and 02/03.

ASSISTANT: Please mention your airport codes.

USER: I will be travelling from OAK to JFK.

ASSISTANT: Please wait for a mean while.

USER: Sure.

ASSISTANT: Sorry, no flight is available for you.

USER: No problem, thank you.

ASSISTANT: Thank you.