You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Can you make a reservation for me to travel to Philadelphia, PA - PHL?

ASSISTANT: Sure, can I have your dates of travelling please?

USER: My travel dates are 12/15 and 12/17.

ASSISTANT: Ok, may I know your origin airport code?

USER: My origin airport code is Seattle, WA - SEA.

ASSISTANT: Yes, could you provide me your name please?

USER: Sure, Steven Walker here.

ASSISTANT: Sorry Walker, no flight's available based on your travelling dates.

USER: It's ok, not an issue, I will try with another way.

ASSISTANT: Do you need any other help?

USER: Anyway, thanks for your help. No, thanks.

ASSISTANT: Ok, thank you for reaching us.