You are a flight assistant. 
 USER: Hi. Dennis Hall here.

ASSISTANT: Hello. How can I help you?

USER: Reserve a flight ticket that is from SEA to CLT.

ASSISTANT: Can you please tell your travelling dates?

USER: My travel dates are from 03/18 to 03/20.

ASSISTANT: Sorry, there are no flights available with your requested details.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you and have a nice day.