You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nancy Mitchell.

ASSISTANT: How may I aid you today?

USER: I need to book a ticket from SFO to SEA to attend the marriage function. Could you please help me in booking a direct flight?

ASSISTANT: Sure. On which dates your going to book a flight ticket?

USER: My travelling dates are 09/20 and return on 09/22.

ASSISTANT: Do you have any fare limit?

USER: 500 is my fare limit.

ASSISTANT: Thanks for sharing your details, we are unable to find a flight on your journey routes.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for approaching us.