You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: Can you help me in doing a reservation from PHL to OAK?

ASSISTANT: Sure, may I know your good name?

USER: I am David Hill.

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

USER: My trip dates are Dec 10 to 12.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight which returns in morning.

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

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for opting us.