You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I aid you?

USER: I am Raymond Robinson. Please book me a ticket from LAX to LGA to meet old friends.

ASSISTANT: Sure, May I know your travelling dates?

USER: I have planned to travel on 08/16 and 08/18.

ASSISTANT: Do you have any preferences?

USER: I need a halt.

ASSISTANT: Please wait.

USER: Ok, I will wait.

ASSISTANT: Thanks for waiting. There are no flights found on your data.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.