You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Joshua Gonzalez. I am looking for a flight from DCA to CLT, can you please help me for booking?

ASSISTANT: Sure, I will help you. Can you please provide me your travelling dates?

USER: My trip dates are from 04/10 till 04/12.

ASSISTANT: There is no flight is available for you on your route.

USER: It's ok, thank you for checking.

ASSISTANT: Sorry for inconvenience. Thank you for choosing us.