You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Charles Davis here.

ASSISTANT: How can I serve you?

USER: I am a magician, I would like to do magic show at Denver. Please help me in booking a ticket from OAK to DEN.

ASSISTANT: Sure. Can I know your travelling dates?

USER: Ok, I would like to travel on 08/09 and return on 08/11.

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 checking.

ASSISTANT: Thank you for choosing us.