You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you please help me to book a flight from IAD to MSP?

ASSISTANT: May I know your trip dates?

USER: I will travel on May 15th and 17th.

ASSISTANT: Do you prefer any specifications?

USER: I prefer to fly in business class.

ASSISTANT: Sorry, no flights found on your route.

USER: No worries, thank you.

ASSISTANT: Thank you. May I know your name.

USER: My name is Edward Lewis.

ASSISTANT: Thank you.