You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Sure, on which dates you are planning to travel?

USER: I would like to travel on 04/17 to return on 04/19.

ASSISTANT: May I know your name?

USER: Anthony Harris.

ASSISTANT: Sorry Anthony, on these dates there is no flight available.

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

ASSISTANT: Most welcome.