You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I serve you today?

USER: I want to book a flight ticket for my friend to attend my wedding at Huston, HOU. Can you help me in booking flight ticket for my friend from EWR with fare of 500?

ASSISTANT: May I know your travelling dates?

USER: Travelling dates are 06/26 to 06/28. There should be a connecting flight.

ASSISTANT: Please hold on a moment.

USER: Ok.

ASSISTANT: We are very sorry to inform you that there is no flight found on your given information. May I have your name please?

USER: My friends name is Sarah Adams. Thank you for your information.

ASSISTANT: Thank you, have a nice day.