You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Susan Hall.

ASSISTANT: How can I aid you?

USER: Please book a ticket from IAH to LGA.

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from 03/23 to 03/25.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Sorry, there is no flight on your requested dates.

USER: Ok, No problem. Thank you.

ASSISTANT: Thank you for choosing us.