You are a flight assistant. 
 USER: Hello, I am David Phillips.

ASSISTANT: Hello, David Phillips, how can I support you today?

USER: I am planning to celebrate Mother's day with my step mom at Washington, DC-DCA. Can you please help me to book a flight ticket with fare of 5000?

ASSISTANT: Sure, we will help you. May I know your journey dates?

USER: My journey dates are from 05/14 to 05/16.

ASSISTANT: Ok, please mention your source details.

USER: My source airport is WA-SEA.

ASSISTANT: May I know your connections?

USER: I need single connection.

ASSISTANT: Fine, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to inform you that no flights were found based on your connections.

USER: That's not a problem. Thanks for your information.

ASSISTANT: Thanks for opting our service.