You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Helen Edwards.

ASSISTANT: How may I guide you?

USER: I am looking for a flight from DTW to LAX, can you book the flight ticket please?

ASSISTANT: Sure Helen, I am here to help you. Could you please share me your journey dates?

USER: My trip dates are from 06/05 till 06/07.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Helen, sorry no flights are available on your prefer dates.

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

ASSISTANT: Thank you Helen for contacting us.