You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Carol Harris. Can you help me to book a flight from PHX to ATL?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are 08/15 and 08/17.

ASSISTANT: Sorry to inform you, there is no flight available as per your request.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Most welcome.