You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Patrick Rodriguez.

ASSISTANT: How may I assist you today?

USER: I need to book a flight ticket from BOS to LAX, Can you please help me for booking?

ASSISTANT: Sure, please provide me your travel dates.

USER: I would like to travel on 05/27 to return on 05/29.

ASSISTANT: Sorry, I could not find any flight with your travel dates.

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

ASSISTANT: My pleasure.