You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Robert Robinson here.

ASSISTANT: How can I help you?

USER: I want to book a flight reservation on the route from SEA to PHL, can you help me?

ASSISTANT: Sure, may I know your journey dates please?

USER: My travelling dates will be from 07/24 to 07/26.

ASSISTANT: According to your details, there is no flight services available on this route.

USER: Oh! That's very sad to know, thank you for checking anyways.

ASSISTANT: Thank you for approaching us.

USER: Most welcome.