You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am George Perez.

ASSISTANT: What assistance you are expecting from us?

USER: I am planning to visit Music Concert at San Francisco, could you please help me with booking a flight ticket?

ASSISTANT: Ok, I can assist you in searching a flight. Please tell me your travelling dates to search a flight.

USER: I would like to take off on 12/08 and return on 12/10.

ASSISTANT: Which airports do you prefer to travel?

USER: My nearest source airport code is ATL and destination airport code is SFO.

ASSISTANT: Ok, can you please wait a minute?

USER: Sure.

ASSISTANT: Sorry to inform you George, there are no flights running in the dates you have given due to some climatic changes.

USER: That's ok, I will find an another alternate way to complete my trip.

ASSISTANT: Ok. Thank you for consulting our travel agency.

USER: Thank you for the information.

ASSISTANT: You are welcome.