You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I serve you today?

USER: I want to reserve my ticket from SFO to JFK, can you please help me in booking?

ASSISTANT: Sure, we are mirthful to assist you in booking. Can you please share your planned travelling dates to proceed further?

USER: Sure, my planned dates of journey are from Mar, 23 to Mar, 25.

ASSISTANT: Please share if you have any connection preference.

USER: Yes, I want a single connecting flight.

ASSISTANT: Is there any other preferences that you would like to add before booking?

USER: Not required.

ASSISTANT: Ok, please wait a moment I'll check and revert to you.

USER: Sure, I will wait.

ASSISTANT: May I know your name please?

USER: Sure, my name is William Lee.

ASSISTANT: Thank you for providing your name, we are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: Ok, not an issue. Anyways, thank you for your service.

ASSISTANT: Thank you for approaching us.