You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Angela Collins.

ASSISTANT: How can I help you today?

USER: I am looking for a flight from BOS to LAS, can you book the flight ticket for me?

ASSISTANT: Sure, I am here to help you in booking. Please share your travel dates also.

USER: My trip dates are from 07/22 till 07/24.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: Thank you for reaching us.