You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I need to go for Desert Botanical Garden in Phoenix, AZ - PHX. Can you please book a flight ticket?

ASSISTANT: Sure, please provide your price limit and connections?

USER: Price limit must be 200 and I need direct flight.

ASSISTANT: Please provide me your source and travel dates?

USER: My source point is at Los Angeles, CA - LAX. My travelling dates are 12/21 and 12/23.

ASSISTANT: Sorry, no flights are found on your requested dates.

USER: Ok, no issue. Thanks for your service.

ASSISTANT: Could I know your name please?

USER: Amy Hall is my name.

ASSISTANT: Thank you, have a nice day.