You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: I am Eric Young. I need to book a ticket with fare of 200. Could you please help me in doing that?

ASSISTANT: Sure, may I know the dates of your journey?

USER: My travelling dates are 04/17 and return on 04/19.

ASSISTANT: Can you provide your airport location codes?

USER: My airport codes are SEA and PHL.

ASSISTANT: There are no flight found on the dates that you have mentioned to book the ticket.

USER: You can proceed with booking. No problem, thank you for your information.

ASSISTANT: You are most welcome and thank you for reaching us.