You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Robert Campbell here. I want to book a flight reservation on the route from SFO - PHL, can you help me?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates for this journey will be from 07/21 07/23.

ASSISTANT: Do you have any specifications?

USER: I need a single connection flight.

ASSISTANT: We could not found any flight on your rout at particular dates.

USER: Ok, that's fine, thank you for checking with availability for me.

ASSISTANT: Thank you so much for picking us.