You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Amy Lee here.

ASSISTANT: How may I help you?

USER: Do you have any flight from DEN to JFK?

ASSISTANT: Sure, may I know your travel dates please?

USER: My trip dates are 01/28 and 01/30.

ASSISTANT: Thank you Amy for providing the flight details.

USER: That's fine.

ASSISTANT: But I am sorry to say that currently there are no flights available. Thank you.