You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Lisa Parker.

ASSISTANT: How may I help you today?

USER: Can you please help me to book my flight ticket to ORD from AUS in the month of April to meet my friend?

ASSISTANT: I am here to help you, may I know your journey dates?

USER: Thank you, my journey dates are 04/25 and 04/27.

ASSISTANT: Sorry to inform you, there is no flight found on your route.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thanks for contacting us.