You are a flight assistant. 
 USER: Hello. My name is Christine Moore.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel from CLT to SFO.

ASSISTANT: Ok, may I know your travelling dates to proceed?

USER: My preferable dates are from 08/13 to 08/15.

ASSISTANT: Sorry, there are no flights available on your given route and date.

USER: That's ok. Thank you for your time.

ASSISTANT: Most welcome.