You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Donald Evans.

ASSISTANT: How can I aid you today?

USER: I would like to attend my friend's wedding at Philadelphia. Can you book me a flight ticket from BOS?

ASSISTANT: Sure, may I know your travel dates?

USER: I am planning to travel on Apr 14 and return on Apr 16.

ASSISTANT: Ok, can you please share your destination airport code to book the ticket for you?

USER: My destination airport code is PHL.

ASSISTANT: Sorry, I did not find any flights for you.

USER: It's ok, no problem. Thank you for your response.

ASSISTANT: Thank you for reaching us.