You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: I am Mark Clark. I am planning to meet my friends at SFO, so can you help me to book a flight from DEN?

ASSISTANT: Sure, please share me your trip dates.

USER: My travelling dates are 07/04 and 07/06.

ASSISTANT: Do you want to travel in connecting flight or direct flight?

USER: I am looking for a single connection flight.

ASSISTANT: Please share if you want to travel in any specific time?

USER: Yes, I want to return at afternoon.

ASSISTANT:  Do you like to go with a economy class or business class?

USER: I am fine with any class.

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: No issues, thank you for your time.

ASSISTANT: Thank you for opting us.