You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to travel from IAD to DTW. Will you please help me in booking my ticket?

ASSISTANT: Yes, I will help you in booking flight ticket. May I know the dates of your travelling?

USER: My dates of travelling are from 07/28 to 07/30.

ASSISTANT: Sure, please wait a moment, I will inform.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you no flights available as per your requested dates. My I know your name for documentation purpose?

USER: My name is Deborah Brown.

ASSISTANT: Thank you for choosing us, have a great day.

USER: Thank you.

ASSISTANT: Welcome.