You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Richard Perez, can you help me booking flight from HOU to ORD?

ASSISTANT: Sue, may I know your planned travel dates?

USER: I am going to start my travel on 08/20 and I am going to return on 08/22.

ASSISTANT: Please hold on for a while.

USER: Ok, I will wait for your reply.

ASSISTANT: There is no flight available on those dates, Perez.

USER: Oh! It's ok, no problem. Thank you for your services.

ASSISTANT: Thank you for choosing us.