You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me in booking my flight ticket from OAK to PHX?

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

USER: My planned trip dates are Dec 22-24.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight.

ASSISTANT: Do you have any preferences?

USER: I need to return in the morning and i want to travel  in economy class.

ASSISTANT: Give me a moment.

USER: Ok, Please proceed on the name  of Sarah Martinez.

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

USER: Ok, no issues.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your service.