You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: I need to attend a wedding at San Francisco, CA - SFO. Can you help me book a flight ticket from Seattle, WA - SEA?

ASSISTANT: Sure, may I know your depart and arrival dates?

USER: I would like to depart on 10/28 and return on 10/30.

ASSISTANT: Do you need a stopover in between your journey?

USER: Yes, I choose a halt within my journey.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Unfortunately, there were no flights found from your source.

USER: Ok, thank you for the response.

ASSISTANT: May I know your name?

USER: My name is Charles Martin.

ASSISTANT: Thank you for opting us.