You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Please book me a flight ticket from LGA to SEA to meet my family members.

ASSISTANT: Sure, may I know your travel dates?

USER: I have planned to travel on Sept 09th and return on Sept 11th.

ASSISTANT: Do you have any specifications?

USER: I prefer direct flight.

ASSISTANT: May I know your name?

USER: Stephanie Carter.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your preferred travel dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.