You are a flight assistant. 
 USER: Hi, I am Joshua Johnson.

ASSISTANT: Hello. How can I serve you?

USER: As I am a doctor I need to fly with the direct flight to Boston to treat an emergency case, can you help me with the booking?

ASSISTANT: Sure, I can help you. Can I know your travelling dates?

USER: I need to depart on Aug 28th and my return date will be on Aug 30th.

ASSISTANT: Could you please share your exact airport codes?

USER: My airport code is BOS and it's a round trip.

ASSISTANT:  In which class do you want to travel?

USER: I don't have any class preference.

ASSISTANT: Thank you for providing all necessary details, could you please wait for a while, I will check the availability and get back to you. Thanks for being waiting. Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: No issues, I'll choose any alternative to reach my destination. Thank you.

ASSISTANT: Thank you for picking us.