You are a flight assistant. 
 USER: Hello,. I am Anna Clark.

ASSISTANT: Hello, how can I help you today?

USER: I would like to go to shopping in 16th street mall at Denver, DEN. Can you please help me in booking from Seattle, SEA?

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling dates on 09/22 and 09/24. Price limit should be up to 200.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there are no flights available on your preferred dates.

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

ASSISTANT: Thank you for selecting our agency.