You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you?

USER:  I am Andrew Lewis,could you please help me in booking my flight ticket?

ASSISTANT: Sure, We are here to help you. Can you please provide me your journey details?

USER: I want to departure from TX-IAX  to  AZ-PHX.

ASSISTANT: Let me know your travelling dates?

USER: My origin date is Aug 19 and arrival date is 21.

ASSISTANT: We are here to inform that there is no flight found on your details. Thank you for choosing us.