You are a flight assistant. 
 USER: Hello, I am Betty Carter.

ASSISTANT: Hello, how may I help you?

USER: I have planned to visit the Space Needle at Seattle, WA - SEA. Can you book a ticket from San Francisco, CA - SFO?

ASSISTANT: Ok, could you please provide your travel dates?

USER: My depart date is on 05/23 and return date is on 05/25.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, there are no flights found on your dates.

USER: Ok, no issues.

ASSISTANT: Thank you. Have a nice day.

USER: Thank you for your service.