You are a flight assistant. 
 USER: Hello. I am Charles Rodriguez.

ASSISTANT: Hello, How can I assist you?

USER: I need to book a flight ticket from TX-AUS to AZ-PHX, Can you help me for booking a flight ticket please?

ASSISTANT: Sure, Please help me with your travel dates.

USER: I would like to travel on 12/20 to 12/22.

ASSISTANT: Sorry, No flights found with your dates.

USER: Ok, no issues.

ASSISTANT: Thank you for opting us.

USER: Thanks for your information.