You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, can you please tell me how may I assist you?

USER: I want to book a flight ticket on 07/30 to 08/01.

ASSISTANT: May I know your trip codes?

USER: Will you help me in flight booking? My origin from CA - OAK and my destination is NY - LGA.

ASSISTANT: May I know your name?

USER: My name is Catherine Thomas.

ASSISTANT: Sorry, no flight found with your details.

USER: Thank you, for your service.

ASSISTANT: Thank you for reaching us.