You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Gregory Walker. I would like book a ticket to San Francisco, can you please help me out?

ASSISTANT: Yes, I am here to help you. Can you please help me with your planned dates?

USER: I am travelling on these dates 09/15 and 09/17.

ASSISTANT: Please provide your location codes about your journey.

USER: I am flying from IAD to SFO.

ASSISTANT: Sorry Walker, there are no flights as per your requirements.

USER: Ok no problem, thank you for your services.

ASSISTANT: My pleasure, thank you for reaching out here.