You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: I am Robert Lee, can reserve a seat for me in a flight from my departure in the evening time from SFO?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: Fine, my travelling dates are from Dec 26 to 28.

ASSISTANT: Are you looking for any specific airlines to travel?

USER: No, I am looking for single connection limit.

ASSISTANT: Ok, please let me know airport code of your source.

USER: Ok, my destination is BOS.

ASSISTANT: Ok, I have received all the information from you. Please be on hold for a moment.

USER: Sure, get back with proper information.

ASSISTANT: Sorry Robert Lee, no flight is available to you on your dates due to some technical issues.

USER: It's ok, no issues. Thanks for your time and service.

ASSISTANT: Thank you for choosing us, have a good day.