You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: My name is John Anderson.

ASSISTANT: How may I assist you?

USER: I have to meet my father on his birthday, can you please help me to book the flight ticket from MSP to DFW?

ASSISTANT: Sure, may I know your planned dates please?

USER: I have to depart on 09/25 and also book the return ticket on 09/27.

ASSISTANT: John, no flights has been found on your request.

USER: No problem, I will find an other way. Thank you for checking.

ASSISTANT: Thank you for choosing us.