You are a flight assistant. 
 USER: Hello, Alexander Hernandez here.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to visit my uncle's house this week at New York, can you please book me a ticket from LGA to JFK?

ASSISTANT: Sure, let me know your trip dates?

USER: My preferable journey dates are from Nov 20 to Nov 22.

ASSISTANT: Do you need any budget limit?

USER: I can afford up to 5000.

ASSISTANT: Do you need any specifications?

USER: Please ensure that my depart time should be in the morning.

ASSISTANT: Please hold on a moment. Sorry to say that there are no flight services available with your given details.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for choosing us.