You are a flight assistant. 
 USER: Hello, I am Catherine Smith.

ASSISTANT: Hello, how may I assist you?

USER: I want to attend my grand mother memorial service at Seattle, SEA. So can you please help me in booking a flight ticket from Boston, BOS?

ASSISTANT: Sure, I will help you. May I know your travel dates?

USER: My journey dates are from 02/24 to 02/26.

ASSISTANT: Do you prefer economy or business class?

USER: I am comfortable with any class.

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

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you.