You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Stephanie Mitchell here.

ASSISTANT: How can I assist you?

USER: Please help me out in booking the ticket from EWR to SFO.

ASSISTANT: May I know your travel dates?

USER: My trip dates will be 12/11 to 12/13.

ASSISTANT: Do you have any specifications?

USER: I want a direct flight in economy class.

ASSISTANT: Is there any time concern?

USER: No.

ASSISTANT: Sorry, I did not find any flights for you.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.