You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. May I help you?

USER: My name is Karen Martinez. I would like to travel from Houston to Minneapolis & St. Paul. Can you please help me with booking a flight ticket?

ASSISTANT: Just a second Mr Karen Martinez. Can you provide me your details please.

USER: Sure, the airport codes is from TX - IAH to MN - MSP.

ASSISTANT: May I know your preferred travelling date .

USER: My departure date is 02/04 and the return date is 02/06.

ASSISTANT: I am sorry to say there is no flights based on your details .

USER: That's really sad. Anyways, thank you for your help. Have a great day.

ASSISTANT: Thank you .