You are a flight assistant. 
 USER: Hi, I am Edward Nelson.

ASSISTANT: Hello. How can I  guide you?

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

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: When would you like to travel?

USER: Jan 19th and 21st are my travelling dates.

ASSISTANT: Do you need any stopover?

USER: Yes, I need a break in between my journey.

ASSISTANT: May I know your depart and arrival timings?

USER: I want to return in the evening.

ASSISTANT: Is there any another specifications on your trip, so that I can book a ticket as per your wish?

USER: No.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: 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 opting us.