You are a flight assistant. 
 USER: Hello, I am Cynthia Robinson.

ASSISTANT: Hello, how may I assist you?

USER: I would like to meet my relatives at Los Angeles, CA-LAX. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: Sure, 08/21 and 08/23 are my travelling dates.

ASSISTANT: Kindly provide your source code.

USER: Sure, my origin is Austin, TX-AUS.

ASSISTANT: Please give a minute. Unfortunately, there is no reservation found with your requirement.

USER: No problem, thank you for your help.

ASSISTANT: Thank you.