You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Davig Hall.

ASSISTANT: How may I help you today?

USER: I would like you to book the flight ticket from AUS to EWR, can you please do that for me?

ASSISTANT: Ok, may I know your travelling dates please?

USER: I have to depart on 08/08 and also book the return ticket on 08/10. Please proceed further by the name of David Hall.

ASSISTANT: I am so sorry to inform you, there is no flight available for your requirement.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for reaching us, have a great day ahead.