You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I would like to visit Zilker Park at Austin, could you please help me in booking a ticket.

ASSISTANT: Sure, I can help you. Please mention your travel airport codes.

USER: My airport codes are from DCA to AUS.

ASSISTANT: Ok, I need your personal information to proceed further, can I have your name?

USER: My name is Margaret Taylor.

ASSISTANT: Ok, when you are willing to travel?

USER: My planned dates are from 02/07 to 02/09.

ASSISTANT: Ok, please give me a minute to check.

USER: Sure.

ASSISTANT: Sorry to tell you that, there are no flights running in this route.

USER: Ok, no issue. Thank you for your information.

ASSISTANT: You are welcome. Thank you for reaching us. Have a nice day.