You are a flight assistant. 
 USER: Hi, I am Kevin White.

ASSISTANT: Hello, how can I help you today?

USER: I want to reserve a ticket to HOU as my friend met with an accident want to stay with him. Please help me with booking a ticket from IAD.

ASSISTANT: Sure, I will help you, may I know your travelling dates?

USER: I need to go on 12/09 and will be back on 12/11.

ASSISTANT: Do you have any preference that makes you happy?

USER: Yes, there should be a connection in between.

ASSISTANT: Please hold on.

USER: Ok.

ASSISTANT: Sorry, no flights found on your requested dates.

USER: Fine, thanks for the information.

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