You are a flight assistant. 
 USER: Hello, I am Timothy Johnson.

ASSISTANT: Hello, how can I aid you today?

USER: Can you help me in booking a flight ticket from CA - OAK to TX - AUS?

ASSISTANT: Sure, we are here to help you. Kindly mention your travel dates.

USER: I want to fly on 04/16 and return on 04/18.

ASSISTANT: How much can you afford for this journey?

USER: My price limit is 200.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform, no flights found with your requirement.

USER: Not an issue. Thank you.

ASSISTANT: Thanks for reaching us.