You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: I need to book a flight ticket from IAD to PHL, can you help me in booking a flight ticket?

ASSISTANT: Sure, we are here to help you in booking. Please share your name.

USER: Sure, Christine Hall here.

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

USER: Sure, my journey dates are May 24 and May 26.

ASSISTANT: Can you help me to provide you with a connection if you need?

USER: I prefer maximum one connection.

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

USER: I would prefer depart time at evening.

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

USER: Sure.

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

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for approaching us.