You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I need a connecting flight for my journey, can you please help me out with booking of a flight ticket?

ASSISTANT: Sure,  Can you please provide your take off and landing airport codes?

USER: Sure, I want to travel from DCA to PHL.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: I am planning to move on Aug 17 and please book my return ticket also on Aug 19.

ASSISTANT: In which class would you like me to book your flight ticket?

USER: I will prefer economy class for my journey.

ASSISTANT: Do you have any other requirements?

USER: I would like to return at evening time.

ASSISTANT: On what name, do I need to reserve your ticket?

USER: Sure, my name is Laura Evans.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for the information.

ASSISTANT: Thank you for choosing us.

USER: Welcome.