You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Amy Hernandez.

ASSISTANT: How may I assist you now?

USER: I have a plan to meet my friend in Boston. Can you help me for booking a flight ticket from DEN to BOS?

ASSISTANT: Amy Hernandez, may I know your travelling dates?

USER: My travelling dates are Aug 04 and Aug 06.

ASSISTANT: So sorry to inform you, there are no flights available on your requested route.

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

ASSISTANT: Thank you for choosing us. Have a great day ahead.

USER: Welcome.