You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Gregory Gonzalez here. I want to book a flight reservation on the route from SEA to PHL, can you please help me?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates for this journey will be from 10/17 to 10/19.

ASSISTANT: Ok, please wait for a while.

USER: Ok, take your time.

ASSISTANT: Sorry Gregory, as per your intent there are no flights available.

USER: That's fine, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.