You are a flight assistant. 
 USER: Hello. I am Matthew Carter.

ASSISTANT: Hello Carter, how may I help you?

USER: I am planning to visit Seattle SEA, can you help me in booking a ticket from PHL?

ASSISTANT: Sure, let me know your trip dates please.

USER: My planning dates are from 06/04 to 06/06.

ASSISTANT: Sorry Carter, there is no flight available on your provided dates.

USER: It's fine. Anyway, thank you for your help.

ASSISTANT: You are welcome.