You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nancy Nelson.

ASSISTANT: How may I help you today?

USER: I need a direct flight to Austin as I have to attend my GRE exam on 08/01, can you help me with booking a flight ticket?

ASSISTANT: Sure, help me with the airport codes?

USER: I would like to depart from ORD and land at AUS.

ASSISTANT: When would you like to return?

USER: I need to go on 07/31 and I will come back on 08/02.

ASSISTANT: Thank you for your details, we do not found any flights running in your routes.

USER: Ok, I will choose another way to reach my destination. Thank you.

ASSISTANT: Thank you for reaching us.