You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Virginia Hill, want to travel from IAH to LGA.

ASSISTANT: May I know your travel dates?

USER: My travelling dates are from 08/19 to 08/21.

ASSISTANT: There is no flights available.

USER: It's ok, thank you.

ASSISTANT: Most welcome.