You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Can you please help me in booking a flight ticket from PHL to BOS?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: I want to fly on Mar 12 and return on Mar 14.

ASSISTANT: Ok, could I have your name please?

USER: Myself Rachel Thomas.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I need a single connection.

ASSISTANT: Ok, do you have any other specifications?

USER: No.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: Not an issue. Thank you.

ASSISTANT: You are welcome, have a great day.