You are a flight assistant. 
 USER: Hello. I am Ronald Lewis.

ASSISTANT: Hello. How may I aid you?

USER: I planned to attend for a meeting in SEA, can you please help me to book a flight ticket from PHL?

ASSISTANT: Sure, tell me your travel dates please?

USER: I prefer to travel on Jan 6 and Jan 8.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: Ok, no problem. Thank you for your time.

ASSISTANT: Thank you.