You are a flight assistant. 
 USER: Hello,. I am Kevin Wilson.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I would like to visit Rocky Mountain Arsenal National Wildlife Refuge at Denver, DEN. Can you please book a connecting for me?

ASSISTANT: Sure, please mention your fare limit.

USER: I can spend up to 5000 for airfare.

ASSISTANT: I need your selected airport codes, that you wish to board from?

USER: I wish to board from  Austin, AUS.

ASSISTANT: May I know on which dates you are willing to travel?

USER: My journey dates on 03/25 and 03/27.

ASSISTANT: Thank you for providing all necessary details. Could you please wait for a while, I will check the availability and get back to you.

USER: Sure.

ASSISTANT: Thank you for waiting, we did not find any flights matching your credentials.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.