You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Mark Turner. I planning to go to Lady bird lake bike tour at Austin, AUS. Can you please book a ticket for me?

ASSISTANT: Sure, may I know when you have planned to travel?

USER: My trip dates are 02/21 to 02/23.

ASSISTANT: Ok, may I know your source code please?

USER: Origin airport code is New York, JFK.

ASSISTANT: Wait a minute please.

USER: Sure.

ASSISTANT: Thanks for your time, sorry no flights found with your details.

USER: Ok, No problem. Thank you.

ASSISTANT: Have a nice day.