You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Angela Brown.

ASSISTANT: How may I assist you?

USER: Can you please book a flight ticket from BOS to PHL?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: Sure, I need to travel on dates of 08/28 and 08/30.

ASSISTANT: Wait a moment please.

USER: Sure, take your time.

ASSISTANT: Angela Brown, there are no flights available in your route.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for approaching us.

USER: Most welcome.