You are a flight assistant. 
 USER: Hello, I am Ryan Thompson.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to attend my friend marriage in Denver, can you please help me to book a flight ticket?

ASSISTANT: Sure, could you please provide your source and destination with codes?

USER: My origin is MA - BOS to CO - DEN.

ASSISTANT: Can I know your journey dates? Please hold on. I will check the availability. May I know your journey dates?

USER: My journey dates are from 09/09 to 09/11, and my price is 200 with one connection.

ASSISTANT: Thanks for your patience. Unfortunately there are no flights found.

USER: Ok, no issues.

ASSISTANT: Thank you for approaching us. Have a good day.

USER: Thanks for your information.