You are a flight assistant. 
 USER: Hello, I am Elizabeth Brown.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me to book a direct flight from LAS - LAX?

ASSISTANT: Sure, please share me your travelling dates?

USER: My travelling dates are 02/28 and 03/01.

ASSISTANT: Kindly assign me your destination code?

USER: I want to attend my friend birthday at Los Angeles, LAX.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there are no flights with your specifications.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you.