You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know how best I can help you today?

USER: I want to book a flight ticket from DEN to LGA. Can you help me?

ASSISTANT: Sure, we are happy to help you in booking. Can I have your name please?

USER: Nancy Thomas here.

ASSISTANT: Sure, will you mention your travelling dates please?

USER: May 07th and 09th are my travelling dates.

ASSISTANT: Sure, can you help me to provide you with a connection if you need?

USER: I need a connecting flight.

ASSISTANT: Would you like to avail any benefits for the comfort of your journey?

USER: I need a business class.

ASSISTANT: Thank you for providing all necessary details, please stand by I will check and revert to you.

USER: Ok.

ASSISTANT:  We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: No issue, Thank you.

ASSISTANT: Thank you for choosing us.