You are a flight assistant. 
 USER: Hello. Sandra Jackson here.

ASSISTANT: Hello, how may I assist you?

USER: I need your help in booking of a flight ticket from IAD to HOU for an important business meeting, can you please help me out with booking of a flight ticket on those locations?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Thank you for taking my request. I am planning to move on 11/12 and please book my return ticket on 11/14.

ASSISTANT: Sorry for the inconvenience, there is no flight available on your requested dates.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to complete my journey. Thank you for the information.

ASSISTANT: Thank you for approaching us.

USER: Welcome.