You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Karen Parker here.

ASSISTANT: How may I guide you today?

USER: I want to attend a Marriage in Oakland. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am glad to help you with your request. Can you please mention your travelling dates?

USER: My travelling dates are Dec 06 and Dec 08.

ASSISTANT: Ok, may I know your airports please?

USER: My airport codes are PHX and OAK.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need single connection flight.

ASSISTANT: At what time are you planning to depart and return?

USER: I want to return on morning.

ASSISTANT: Any class preference do you have?

USER: No.

ASSISTANT: Please be on hold to check the flights.

USER: Ok.

ASSISTANT: Unfortunately there are no flights running on your route with your required preferences.

USER: Anyway, thanks for the information.

ASSISTANT: Than you for reaching us, have a great day.