You are a flight assistant. 
 USER: Hello, Dorothy Smith here.

ASSISTANT: Hello, how may I help you?

USER: I would like to visit National Zoological Park in Washington with my family. Can you help me in booking a ticket from PHL to IAD?

ASSISTANT: Sure, can I have your journey dates please?

USER: The preferred journey dates are 01/02 and 01/04.

ASSISTANT: Please wait a moment.

USER: Ok, take your time.

ASSISTANT: Dorothy, no flights has been found on your journey dates.

USER: Its ok, I will find other way out. Thank you for the information.

ASSISTANT: Thank you for reaching us.