You are a flight assistant. 
 USER: Hello,. I am Thomas Parker.

ASSISTANT: Hello, How can I serve you?

USER: I want to go to my grandmother memorial service at Oakland, CA - OAK. Can you please help me in booking?

ASSISTANT: Sure, May I know the source code?

USER: Source is from Austin, TX - AUS.

ASSISTANT: Please help me with your travel dates.

USER: I want to travel on 09/10, and need to catch return flight on 09/12.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for reaching us.