You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Elizabeth Green here.

ASSISTANT: How may I aid you today?

USER: I need a flight ticket from BOS to PHX as I want to visit my university for a convocation ceremony.

ASSISTANT: Sure, I will help you with that. Can you please share your journey dates?

USER: I want to travel from 08/13 to 08/15.

ASSISTANT: Wait for while.

USER: Sure.

ASSISTANT: I am sorry to say that there is no flight found.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.