You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ruth Edwards.

ASSISTANT: How may I help you today?

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

ASSISTANT: Please mention your travelling dates, so I can proceed further checking.

USER: Sure, I need to travel on dates of 02/18 and 02/20.

ASSISTANT: Please hold a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no flight ticket available on your journey dates.

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

ASSISTANT: Thank you for reaching us.