You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mark Taylor.

ASSISTANT: How can I assist you?

USER: I am planning to book a ticket to meet my family at BOS. Can you please help me out to book a ticket from SFO?

ASSISTANT: Ok, may I know your travelling dates?

USER: These are my travelling dates 09/23 and return back on 09/25.

ASSISTANT: Please wait. Sorry, no flights found on your route.

USER: That's fine. Thank you for your service.

ASSISTANT: Ok, thank you for reaching us.