You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Robert Gonzalez here and I am looking for a flight ticket between MSP and SFO, can you please check is there any flight available on those locations?

ASSISTANT: Sure, can you please share your travel dates?

USER: Thank you, my departure is on Apr 27 and please book my return ticket also on Apr 29.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Robert Gonzalez, I am sorry to inform you that there is no flight available at your request.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to reach my destination. Thank you for the information.

ASSISTANT: You are welcome. Thank you for contacting us.

USER: Welcome.