You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: Margaret Mitchell here. Can you book me a ticket from PHL to JFK?

ASSISTANT: Sure, can I know your preferable dates?

USER: Ok, here are my travelling dates 01/01 and 01/03.

ASSISTANT: I am sorry, there are no flights available with your given dates.

USER: No issues, thank you for the help.

ASSISTANT: That's ok. Thank you.