You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER:  My convocation is going to held in Phoenix, can you help me in booking a ticket from AUS to PHX?

ASSISTANT: Please provide me your journey dates.

USER: My trip dates are 08/23 to 08/25.

ASSISTANT: May I know your name please to proceed further?

USER: My name is Catherine Brown.

ASSISTANT: There are no flights available at this moment, Brown.

USER: Thank you for checking.

ASSISTANT: Thank you for reaching us.