You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Donna Perez. I am a dental student, I have to attend a seminar on dental implants. Could you book my ticket from HOU to ATL?

ASSISTANT: May I know your desired travel dates please?

USER: My journey dates are 05/19 to 05/21.

ASSISTANT: Please wait a while, I will check and inform you.

USER: Sure.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: No issue, thank you for checking.

ASSISTANT: Thank you for contacting us.