You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Patricia Thomson.

ASSISTANT: Ok.

USER: Please book me a ticket from LGA to SEA to meet my friends.

ASSISTANT: Sure, I will help you. May I know your planned dates to travel?

USER: I have planned to travel on 12/16 and 12/18.

ASSISTANT: Sorry to inform you that, no flights are available with your requirement.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.