You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I want to book a ticket from IAH to SFO, can you assist me in booking?

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

USER: My preferred dates are Nov 19th and Nov 21.

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

USER: Eric Lewis.

ASSISTANT: Let me know your connection limit?

USER: I need one connection between my trip.

ASSISTANT: Do you have any other requirements?

USER: Make sure that my return time must be afternoon.

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

USER: Sure.

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

USER: No problem, thank you for helping me.

ASSISTANT: Thank you for choosing us.