You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you for the day?

USER: To watch the World Series with my parents, help me in booking a ticket on 05/24.

ASSISTANT: Sure, when are you planning to return on?

USER: I would like to return on 05/26.

ASSISTANT:  Form which airport will you catch your flight?

USER: From Seattle, SEA I have to fly.

ASSISTANT: May I know your landing airport?

USER: Destination is to Oakland, OAK.

ASSISTANT: May I know your good name?

USER: Nancy Davis is my good name.

ASSISTANT: I regret that there are no flights available with the given route.

USER: Not a problem. Thank you for aiding me.

ASSISTANT: Thank you.