You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am searching a direct flight to Boston, can you please help me to book a ticket from PHL to BOS?

ASSISTANT: Sure, may I know your dates of journey please for further processing of booking?

USER: Sure, my preferable dates of journey are from 02/13 to 02/15.

ASSISTANT: Ok, may I know your name please for booking a flight ticket?

USER: My name is Laura Young.

ASSISTANT: Ok, please wait for a while.

USER: Sure, carry on.

ASSISTANT: Sorry Laura, there is no flights found on your travelling details.

USER: Ok, no problem.

ASSISTANT: Are you expecting any other help from me?

USER: No, thank you for your help.

ASSISTANT: You are welcome always.

USER: Welcome.