You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to travel from New York to Seattle for attending a Marriage. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, please provide your airport codes.

USER: My airport codes are from EWR to SEA.

ASSISTANT: Can you please share your journey dates?

USER: My travelling dates are from 05/11 to 05/13.

ASSISTANT: May I know your name?

USER: Sure, my name is William King.

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

USER: Oh! it's sad to hear. Anyway, thank you for the information.

ASSISTANT: Thank you for contacting us.