You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Yes, can you tell me your travelling dates?

USER: My travelling dates are Dec 25 and Dec 27.

ASSISTANT: Can you share me your nearest airport codes?

USER: My airport codes are EWR and OAK.

ASSISTANT: Do you have any other specifications?

USER: I want to return on evening.

ASSISTANT: Do you have any preferences?

USER: I would prefer single connecting flight.

ASSISTANT: Give me a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry to inform you that there are no flights found on your requested criteria.

USER: Anyway, thanks for the information.

ASSISTANT: Can I know your name for documentation?

USER: My name is Barbara Roberts. Thanks for the information.

ASSISTANT: Thank you for contacting us.