You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Matthew Lewis here.

ASSISTANT: How may I help you Lewis?

USER: Please help me out in booking a ticket from SFO to BOS.

ASSISTANT: Please mention your trip dates.

USER: My trip dates will be 06/01 and 06/03.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no flight tickets are available on your route.

USER: Its ok, no issues. Thank you.

ASSISTANT: Thank you for choosing our service.