You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I  assist you today?

USER: I am planning to attend a live concert at Denver, can you help me to book a flight ticket within the fare limit 200?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your airport codes please?

USER: I need to start from Seattle, WA-SEA to reach Denver, CO-DEN.

ASSISTANT: May I know your trip dates please?

USER: I would like to start on 12/14 and my return date will be on 12/16.

ASSISTANT: May I know your name please?

USER: I am Ashley Anderson.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Thanks for waiting. Sorry, there are no flights found with your specifications.

USER: No issues, I'll choose any alternative to reach my destination. Thank you.

ASSISTANT: Thank you for reaching us.