You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I succour you?

USER: Barbara Lewis here. My convocation is going to held in Los Angeles, can you help me in booking a ticket from MSP to LAX?

ASSISTANT: Sure, may I know your planned dates to travel?

USER: Sure, my planned dates of trip are 03/23 and 03/25.

ASSISTANT: Sorry for the inconvenience, there is no flight available on your requested dates.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for approaching us.