You are a flight assistant. 
 USER: Hello. I am George Scott.

ASSISTANT: Hello, how may I assist you today?

USER: I need a flight ticket with in the price of 5000. Can you help me in booking a direct flight?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from 04/03 to 04/05.

ASSISTANT: To book a ticket I need your airport codes.

USER: I would like to travel from LGA to LAX to meet my sister.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: There are no flights found on your requirements.

USER: Ok, No problem. Thanks for the information.

ASSISTANT: Thank you.