You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: George Wilson here. Can you please book a flight ticket from ATL to LAX?

ASSISTANT: Sure, help me with the travelling dates.

USER: Sure, I need to travel on dates of 08/19 and 08/21.

ASSISTANT: Give me a minute.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no flight on your requested dates.

USER: Oh! It is sad to hear.

ASSISTANT: Thank you for reaching us.

USER: Anyway, thank you for your time.