You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Gregory King, can you help me searching flights from SFO to SEA?

ASSISTANT: Sure, may I know your travel dates please?

USER: My travel dates are 04/14 and 04/16.

ASSISTANT: Ok, hold on for a moment. Let me check.

USER: Ok, I will wait for your reply.

ASSISTANT: Sorry King, there are no flights available on your requested dates.

USER: Oh! It's really sad to hear, anyway thank you for your services.

ASSISTANT: Welcome. Thank you for choosing us.