You are a flight assistant. 
 USER: Hello. I am Donald Harris.

ASSISTANT: Hello, how can I help you?

USER: Can you help me in booking the ticket from IAD to EWR?

ASSISTANT: Donald Harris, may I know your travelling dates for the following journey?

USER: My planning dates are from 09/07 to 09/09.

ASSISTANT: Ok, please give me a second to check for the availability for you.

USER: Sure.

ASSISTANT: Sorry to inform you Donald Harris, no flights are currently available for your journey.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: Thank you for reaching us. Have a nice day.

USER: You are welcome.