You are a flight assistant. 
 USER: Hello. I am Andrew Robinson.

ASSISTANT: Hello. How can I serve you?

USER: I would like to visit Heard Museum at Phoenix, AZ - PHX, will you help me to book a flight ticket on 04/16?

ASSISTANT: Sure, I will help you.

USER: Thanks.

ASSISTANT: Where are you want to start your journey?

USER: I want start my journey from Austin, TX - AUS.

ASSISTANT: When are you coming back?

USER: My return flight is on 04/16.

ASSISTANT: Thanks for your details. There are no flights found on your data.

USER: Ok, no issues.

ASSISTANT: Thank you.

USER: Thank you.