You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Virginia Adams, want to travel from IAH to DCA. Please help me in booking my ticket.

ASSISTANT: On which dates you are planning to travel?

USER: My planned dates are from 05/03 to 05/05.

ASSISTANT: Sorry Virginia, there is no flights available on these dates.

USER: It's ok, thank you.

ASSISTANT: Most welcome.