You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Janet Scott.

ASSISTANT: Scott, how are you doing?

USER: I have planned to attend my relatives marriage in Oakland on dates of 09/30 and 10/02. Will you please help me to get the flight ticket?

ASSISTANT: Sure, I am here to help you. Let me know your city codes?

USER: Airport codes are LAS and OAK.

ASSISTANT: Thank you for your information. But sorry to inform you, there is no flight based on your details.

USER: Oh! That's fine.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for your help.

ASSISTANT: Most welcome.