You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I want to met my friends on this weekend. Can you check the flight availability from IAD to DEN?

ASSISTANT: Sure, May I know your travelling dates?

USER: My planned travel dates are 05/09 an 05/11.

ASSISTANT: Do you have any class preference?

USER: I need business class with 1 connection flight only.

ASSISTANT: Is there any other preferences?

USER: No more, thank you.

ASSISTANT: May I know your name?

USER: Sure,Christopher Martinez here.

ASSISTANT: Thanks for your details, there are no flights found on your data.

USER: No issues, thank you for the information.

ASSISTANT: Thank you.