You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Justin Lopez, I need to book a flight ticket to SEA from SFO in the month of September. Can you please help me?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My travelling dates are 09/27 and 09/29.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no flights available under your preferable details.

USER: Not a problem, anyway thank you for the information.

ASSISTANT: Welcome, have a great day.