You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am George Martin.

ASSISTANT: How may I help you?

USER: I want to book a ticket from DTW to LAX to attend seminar, can you help me in booking?

ASSISTANT: Sure, I am here to help you that. Can you please provide your trip dates?

USER: I am departing on 05/30 and return on 06/01.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no flights found on your travelling dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for approaching us.