You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Linda Robinson here.

ASSISTANT: How can I serve you for the day Linda?

USER: There is conference in PHX, so I want to book a ticket from JFK.

ASSISTANT: Sure, just tell me your trip dates?

USER: I am travelling on 01/08 to 01/10.

ASSISTANT: Sad to inform you, their is no flight for your requirements.

USER: It's ok, thanks for your help.

ASSISTANT: Thanks for reaching us.