You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you today?

USER: I want to book a flight ticket, will you help me?

ASSISTANT: Sure, can you please provide your name and journey details?

USER: I am Gary  Walker, I want to travel from TX-AUS TO CA-SFO. My departure day is 11/16 and arrival day is 11/18. The flight ticket price  limit should be 5000.

ASSISTANT: Thanks for providing your details. Please wait a moment, I will check and let you know.

USER: Sure.

ASSISTANT: Thanks for your patience. We have not found any flights with your details.

USER: OK,thank you for giving information.

ASSISTANT: Thanks for contacting us, Have a good day.