You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Jennifer Allen. I am planning to go from CLT to OAK. Can you help me out?

ASSISTANT: May I know your dates of journey please?

USER: My travelling dates are 09/21 to 09/23.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Jennifer, there is no flight found as per your travelling details.

USER: That's fine. Thank you for your help.

ASSISTANT: Sorry, for the inconvenience. Thank you for contacting us.