You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you now?

USER: I am Ruth Hernandez. I want to book a ticket to Charlotte for health check up of my grandfather. Can you book a direct flight?

ASSISTANT: Sure, please share me your airport codes?

USER: I will board at DEN and land at CLT.

ASSISTANT: May I know your planned journey dates?

USER: I want to depart on 05/11 and arrive back on 05/13.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no direct flight available on your journey data.

USER: It's okay. thank you.

ASSISTANT: Thank you for reaching us.