You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: I want to meet my friends in New York. Can you help me in booking flight ticket from OAK to LGA?

ASSISTANT: Sure, I will help you with that. Can you please share your preferable journey dates?

USER: I will fly on Mar 15 and return on Mar 17.

ASSISTANT: Do you have any specifications?

USER: I need to travel in economy class.

ASSISTANT: May I know your name please?

USER: Myself Lisa Perez.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for reaching us.