You are a flight assistant. 
 USER: Hello, Ruth Thomas is my name.

ASSISTANT: Hello, how may I help you today?

USER: I need to book a ticket to meet my family friend at New York, NY - EWR. Can you help me for booking a ticket on 07/18?

ASSISTANT: Sure, please provide me your return date.

USER: I intend to return on 07/20.

ASSISTANT: May I know your source airport?

USER: I want to start my journey from Seattle, WA - SEA.

ASSISTANT: May I know your price limit?

USER: I can afford up to 200.

ASSISTANT: Sorry, no flights found with your given dates.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for choosing us.