You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Larry King here.

ASSISTANT: How may I guide you today?

USER: I want to book a ticket from DCA to PHL, to visit the place Philadelphia Museum of Art.

ASSISTANT: Sure, I will help you that.

USER: Thank you.

ASSISTANT: Can you please share your journey dates?

USER: My planned dates 09/02 and 09/04.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: I am sorry to say that there is  no flight found.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for reaching us.