You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Nancy Jackson is my name.

ASSISTANT: Hi Nancy Jackson nice to meet you.

USER: I am here for asking a help from your agency in flight booking process. I want to travel from LAS to SFO.

ASSISTANT: Sure, I am here to help you for this. Could you please share me your travel dates?

USER: My trip dates will be May 5 to May 7.

ASSISTANT: Is there any preference regarding your journey?

USER: My return journey must be in the afternoon in business class.

ASSISTANT: Do you have any specifications?

USER: I want a connected flight.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to inform, no flights are found with your criteria.

USER: That's ok, thank you.

ASSISTANT: Thank you very much for contacting our agency.