You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Eric Taylor.

ASSISTANT: Nice to meet you Eric.

USER: I am planning to visit DEN to meet my brother, can you please find a flight from BOS?

ASSISTANT: Sure, may I know your travel dates to search a flight?

USER: My travelling dates are 12/20 and 12/22.

ASSISTANT: Sorry, I could not find any flight with your travel dates.

USER: That's ok, thank you for checking.

ASSISTANT: My pleasure.