You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sarah Collins.

ASSISTANT: What service do you need from our travel agency?

USER: I need to visit Minneapolis to meet my friend so please book a flight ticket from Houston.

ASSISTANT: Sure, I am here to help you. Will you please provide me your airport codes?

USER: Sure, I would like to travel from IAH to MSP.

ASSISTANT: Ok, on which dates you are willing to travel?

USER: Sure, I need to travel on dates of 09/21 and 09/23.

ASSISTANT: Ok, please hold on for a minute.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you, there is no flight available with the dates you have given.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

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

USER: Most welcome.