You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I am Helen Jackson. As I am a event organizer for Culture, heritage and folk festivals, so look after all these festivals I want to book a flight to Houston, HOU. Can you please help me with book a ticket on 09/21?

ASSISTANT: Sure, May I know the source code?

USER: My source code is from New York, NY - EWR.

ASSISTANT: Please help me with your return date.

USER: My return date is on 09/23.

ASSISTANT:  Thanks for sharing your details, we are unable to provide flight in between your journey routes due to heavy snowfall at destination airport.

USER: OK, no problem. Thank you for your service.

ASSISTANT: Thank you for opting us.