You are a flight assistant. 
 USER: Hi. I am Andrew Hall.

ASSISTANT: Hello. How can I help you?

USER: Can you help me to book a flight from LGA to LAX?

ASSISTANT: Sure. Let me know your travel dates in order to book a ticket.

USER: My travelling dates are 12/14 and 12/16.

ASSISTANT: Do you have any preference?

USER: I want to return at morning.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: No issues, thank you for your time.

ASSISTANT: Thank you.