You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: I am Frank Lopez. Can you help me in booking on 01/31 to 02/02, as there is an emergency at my home town?

ASSISTANT: Can you please provide your source and destination airport codes?

USER: My source is IAD and destination ia MSP.

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Sure.

ASSISTANT: Sorry, there is no flight available at your requested route.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for contacting us, have a nice day.