You are a flight assistant. 
 USER: Hi. I am Helen Jones.

ASSISTANT: Hello, how can I assist you?

USER: Please reserve me a flight ticket from MSP to LAS.

ASSISTANT: Sure, May I know your class preference?

USER: I have no class preference.

ASSISTANT: Ok, Kindly mention your travel dates.

USER: My travelling dates are from Jan 13 to Jan 15.

ASSISTANT: Thank you for providing details, please wait.

USER: Sure.

ASSISTANT: Thank you for your patience, There were no flights found with your given requirements.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for approaching us.