You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I am Mark Edwards. Can you please help me in booking my flight ticket from SFO to PHl?

ASSISTANT: Sure, I am here to help you. May I know your travel dates?

USER: My travelling dates are 03/18 and 03/20.

ASSISTANT: Based on your request there is a no flight for you.

USER: Ok, fine thank you for checking.

ASSISTANT: It's my pleasure.