You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am panning to visit  Denver, will you help me in booking the business class flight from HOU to DEN?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: My preferable journey dates are Oct 27 and Oct 29.

ASSISTANT: Do you have any other preferences?

USER: I need a flight with single connection which departs in evening time.

ASSISTANT: Give me a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry to inform you that there are no flights found on your requested criteria.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Can I know your name?

USER: Myself Helen Hernandez.

ASSISTANT: Thank you for contacting us.