You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am planning to meet my uncle in HOU, so please help me in booking a flight ticket from CLT.

ASSISTANT: Sure, may I know your travel dates?

USER: I want to fly on Mar 05 and return on Mar 07.

ASSISTANT: Do you have any specification?

USER: I would like to prefer business class.

ASSISTANT: Please share me your name.

USER: Myself Amanda Clark.

ASSISTANT: Sorry, there is no flight at this moment.

USER: Not an issue. Thank you.

ASSISTANT: Thank you.