You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Christopher Johnson here. Can you please help me in booking a flight ticket from PHX to OAK?

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

USER: Sure, my travel dates are from Jan 25 to Jan 27.

ASSISTANT: Do you have any other specifications?

USER: I would like to return in the evening.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: Give me a moment.

USER: Sure.

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

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

ASSISTANT: Thank you for consulting us.