You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I serve you?

USER: My friend Jerry Young wants to meet me at my home town Austin, so I need to book a flight ticket for him.

ASSISTANT: Could you please send me your travelling dates and the source code? And also please provide me the destination code?

USER: Sure, he wants to travel from TX-DWF on 01/31 and return on 02/02. And destination code is TX-AUS.

ASSISTANT: Please wait a while I will check and get you back.

USER: Ok.

ASSISTANT: Thanks for being waiting. Unfortunately, there are no flights found according to your requirements.

USER: That's not a problem, thank you.

ASSISTANT: Thank you for contacting us.