You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: My name is Benjamin Campbell. Can you assist me in ticket booking for me?

ASSISTANT: Sure, I will help you in booking the ticket.

USER: Thank you.

ASSISTANT: May I know your travelling dates too?

USER: My dates are on 09/25 and back on 09/27.

ASSISTANT: Can I know your airport codes too?

USER: My airport codes are from LGA to OAK.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there are no flights found in our data.

USER: Ok, that's fine. Thank you for your assistance.

ASSISTANT: Thank you for reaching us.